Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis

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Methods: A systematic review was conducted by searching PubMed–MEDLINE and the Cochrane library between January 2010 and January 2020. The included studies were English case control studies that described original data on at least one raw lipid measurement during pregnancy in healthy women who delivered large for gestational age (LGA) newborns and in healthy women with non-LGA newborns. The data extracted from 12 studies were pooled, and the weighted mean difference (WMD) in lipid levels was calculated using random effects models. A meta-analysis was performed to identify sources of heterogeneity and to describe the significant value of the collected studies. Results: Of 649 published articles identified, a total of 12 met the inclusion criteria. Compared with women who had non-LGA newborns, those who had LGA newborns had significantly higher triglyceride (TG) levels (WMD = 0.28, 95% CI −0.02 to 0.54) and lower high density lipoprotein cholestrol (HDL-C) levels (WMD = 0.08, 95% CI −0.13 to −0.03), but not have significantly lower high-density lipoprotein cholesterol (LDL-C) levels. Moreover, the levels of total cholesterol, low-density lipoprotein cholesterol, and very low density lipoprotein cholesterol (VLDL-C) were inconsistent between both groups. Conclusions: High levels of TG and low levels of HDL-C could cause births of LGA newborns whereas maternal serum of TC, LDL-C and VLDL-C cannot be used as predictor of LGA." } { "@context": "http://schema.org", "@type": "BreadcrumbList", "itemListElement": [ { "@type": "ListItem", "position": "1", "item": { "@id": "https://f1000research.com/", "name": "Home" } }, { "@type": "ListItem", "position": "2", "item": { "@id": "https://f1000research.com/browse/articles", "name": "Browse" } }, { "@type": "ListItem", "position": "3", "item": { "@id": "https://f1000research.com/articles/9-1213", "name": "Maternal lipid levels in pregnant women without complications in developing..." } } ] } Home Browse Maternal lipid levels in pregnant women without complications in developing... ALL Metrics - Views Downloads Get PDF Get XML Cite How to cite this article Mahindra MP, Sampurna MTA, Mapindra MP and Sutowo Putri AM. Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.12688/f1000research.26072.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. Close Copy Citation Details Export Export Citation Sciwheel EndNote Ref. Manager Bibtex ProCite Sente EXPORT Select a format first Track Share ▬ ✚ Systematic Review Revised Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] Previously titled: 'Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a meta-analysis' Muhammad Pradhiki Mahindra https://orcid.org/0000-0002-7521-9221 1 , Mahendra Tri Arif Sampurna https://orcid.org/0000-0002-7529-8142 2 , Muhammad Pradhika Mapindra https://orcid.org/0000-0002-3082-4479 1 , Apriska Mega Sutowo Putri 3 Muhammad Pradhiki Mahindra https://orcid.org/0000-0002-7521-9221 1 , Mahendra Tri Arif Sampurna https://orcid.org/0000-0002-7529-8142 2 , Muhammad Pradhika Mapindra https://orcid.org/0000-0002-3082-4479 1 , Apriska Mega Sutowo Putri 3 PUBLISHED 29 Jan 2021 Author details Author details 1 Faculty of Medicine, Hasanuddin University, Makassar, South Sulawesi, 90245, Indonesia 2 Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, East Java, 60115, Indonesia 3 Faculty of Medicine, University of Sebelas Maret, Surakarta, Central Java, 57126, Indonesia Muhammad Pradhiki Mahindra Roles: Conceptualization, Data Curation, Formal Analysis, Methodology, Software, Writing – Original Draft Preparation, Writing – Review & Editing Mahendra Tri Arif Sampurna Roles: Funding Acquisition, Methodology, Project Administration, Supervision, Writing – Review & Editing Muhammad Pradhika Mapindra Roles: Formal Analysis, Funding Acquisition, Investigation, Project Administration, Resources, Writing – Original Draft Preparation, Writing – Review & Editing Apriska Mega Sutowo Putri Roles: Investigation, Resources, Software, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing OPEN PEER REVIEW DETAILS REVIEWER STATUS Abstract Background: Circulating into foetal circulation across the placental barrier, abnormal maternal serum lipids predispose neonates to metabolic dysfunction and thereafter affect the steroid metabolism and functions of extra-embryonic foetal tissues. Methods: A systematic review was conducted by searching PubMed–MEDLINE and the Cochrane library between January 2010 and January 2020. The included studies were English case control studies that described original data on at least one raw lipid measurement during pregnancy in healthy women who delivered large for gestational age (LGA) newborns and in healthy women with non-LGA newborns. The data extracted from 12 studies were pooled, and the weighted mean difference (WMD) in lipid levels was calculated using random effects models. A meta-analysis was performed to identify sources of heterogeneity and to describe the significant value of the collected studies. Results: Of 649 published articles identified, a total of 12 met the inclusion criteria . Compared with women who had non-LGA newborns, those who had LGA newborns had significantly higher triglyceride (TG) levels (WMD = 0.28, 95% CI −0.02 to 0.54) and lower high density lipoprotein cholestrol (HDL-C) levels (WMD = 0.08, 95% CI −0.13 to −0.03), but not have significantly lower high-density lipoprotein cholesterol (LDL-C) levels. Moreover, the levels of total cholesterol, low-density lipoprotein cholesterol, and very low density lipoprotein cholesterol (VLDL-C) were inconsistent between both groups. Conclusions: High levels of TG and low levels of HDL-C could cause births of LGA newborns whereas maternal serum of TC, LDL-C and VLDL-C cannot be used as predictor of LGA. READ ALL READ LESS Keywords GDM, healthy women, LGA, maternal lipids, non-LGA Corresponding Author(s) Mahendra Tri Arif Sampurna ( [email protected] ) Close Corresponding author: Mahendra Tri Arif Sampurna Competing interests: No competing interests were disclosed. Grant information: The author(s) declared that no grants were involved in supporting this work. Copyright: © 2021 Mahindra MP et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. How to cite: Mahindra MP, Sampurna MTA, Mapindra MP and Sutowo Putri AM. Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.12688/f1000research.26072.2 ) First published: 08 Oct 2020, 9 :1213 ( https://doi.org/10.12688/f1000research.26072.1 ) Latest published: 29 Jan 2021, 9 :1213 ( https://doi.org/10.12688/f1000research.26072.2 ) Revised Amendments from Version 1 The title of this article has been changed to maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis. The authors' role of Muhammad Pradhika Mapindra (https://orcid.org/0000-0002-3082-4479) has been added with writing- review, and editing. Several words that expressed misunderstandings about fetuses have been edited to the more appropriate words, such as infants or newborns. In the subheading of study characteristics and assessment of risk bias, the text has been updated according to reviewers' suggestions. Following this, figure 1 elucidates the process of the literature review is replaced by another figure with more precise information. In the results section, the confusing sentences have been changed relevant to reviewers' comments. Furthermore, in the discussion section, the information from previous studies regarding neonatal outcomes of women with high maternal lipids is added. Also, as the reviewer's suggestion, additional information about an unhealthy lifestyle that can affect the disturbances of maternal lipid levels is included in the discussion section. Moreover, the clinical implications from our study findings have been added to the discussion section. As a consequence of these changes, the abstract and keywords of this article are revised as well. The title of this article has been changed to maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis. The authors' role of Muhammad Pradhika Mapindra (https://orcid.org/0000-0002-3082-4479) has been added with writing- review, and editing. Several words that expressed misunderstandings about fetuses have been edited to the more appropriate words, such as infants or newborns. In the subheading of study characteristics and assessment of risk bias, the text has been updated according to reviewers' suggestions. Following this, figure 1 elucidates the process of the literature review is replaced by another figure with more precise information. In the results section, the confusing sentences have been changed relevant to reviewers' comments. Furthermore, in the discussion section, the information from previous studies regarding neonatal outcomes of women with high maternal lipids is added. Also, as the reviewer's suggestion, additional information about an unhealthy lifestyle that can affect the disturbances of maternal lipid levels is included in the discussion section. Moreover, the clinical implications from our study findings have been added to the discussion section. As a consequence of these changes, the abstract and keywords of this article are revised as well. See the authors' detailed response to the review by Victor Samuel Rajadurai See the authors' detailed response to the review by Kian Djien Liem READ REVIEWER RESPONSES Introduction The early stages of pregnancy involve endocrine and metabolic changes and is an important period for placenta formation and foetal development. Epidemiological studies have shown that excessive lipid exposure in the maternal intrauterine environment can affect the development of foetal organs and lead to maternal metabolic impairment 1 . Abnormalities in maternal serum lipids have been highly correlated with birth weight and may be a cause of neonatal metabolic dysfunction 2 . The prevalence of foetal macrosomia in developed countries ranges from 5% to 20%, and several studies have reported that gestational diabetes mellitus (GDM) and maternal obesity were strongly associated with the risks for low and high birth weights. Disturbances in maternal metabolism affect blood glucose and other maternal macronutrients, such as lipids, and subsequently affect the development of the foetus 2 – 4 . The role of triglycerides (TG) is yet to be completely understood, but a cohort study in Amsterdam reported that maternal TG concentrations during the early stages of pregnancy were linearly related with the prevalence of large for gestational age (LGA) newborns 5 . Macrosomic foetuses may develop stillbirth and are at risk for neonatal mortality 5 – 7 . Therefore, LGA newborns have increased risk for developing type 2 diabetes, cardiovascular diseases and hypertension in their adult age 5 – 9 . High maternal serum lipid levels have been shown to increase the likelihood of pregnancy problems, such as GDM, pre-eclampsia and pre-term delivery 2 . Moreover, increase in the levels of TG, total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C) and very low-density lipoprotein cholesterol (VLDL-C) can account for adverse outcomes of normal gestation. Maternal serum lipids are transferred through the placenta, suggesting that they can affect foetal sterol metabolism and the metabolic functions of extra-embryonic foetal tissues 6 , 7 , 9 . These studies implied how essential lipid levels are to foetal development. The impact of high maternal lipid levels on foetal birth weight remains barely recognised in clinical practice, although this is known to be a cause of cardiovascular disease and diabetes 2 . Previous studies have suggested that pregnant women with GDM and normal blood glucose levels had an increased risk for delivering LGA newborns 10 . The positive association between early maternal hypertriglyceridemia and LGA newborns in low-risk women is well recognised in some studies 6 . To further investigate the relationship between maternal lipid levels and LGA newborns, we conducted a systematic review of existing cohort studies to determine the potential role of maternal lipid levels as a risk factor for uncomplicated pregnancy related to LGA newborn delivery. Methods Eligibility criteria This study is reported in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols (PRISMA P) guidelines ( Figure 1 ; Reporting guidelines 11 ). Only research papers written in English between January 2010 and January 2020 were included in our search. We retrieved several papers with abstracts that mentioned an association between maternal TG and LGA newborns. For additional citations, references were collected from the included articles. Then, we determined the eligibility of the included studies using a critical appraisal skill programme (CASP) checklist for cohort model to determine the quality of the included studies. Based on the assessment using CASP tools, we finally included 12 articles to assess and review. The variables extracted from the literature are shown in Table 2 . Full-text articles were acquired and evaluated for eligibility. Figure 1. Flowchart of the Literature Review Process. Literature search We conducted our search, which was conducted from April 2020 to June 2020, in the following databases: PubMed (MEDLINE), Library of Michigan University and the Cochrane library . We applied search strings, including combinations of search terms, as keywords placed in the titles or abstracts of the studies ( Table 1 ). The keywords we used for the search strategy were as follows: 1. maternal lipid profile, lipid profile or lipoprotein and 2. LGA or large for gestational age. Table 1. Electronic search strings. Data Base Keywords (Search Strategy) PubMed (Lipid profile[all fields] OR Triglycerides[MeSH Terms] OR Cholesterol[MeSH] AND LGA[all fields] OR Large for Gestational Age[all fields] Michigan Library (Maternal Lipid profile[all fields] OR Triglycerides[MeSH Terms] OR Cholesterol[MeSH] AND Large for Gestational Age[all fields] Cochrane Library (Lipid profile[all fields] OR Triglycerides[all fields] OR Cholesterol[MeSH] AND LGA[all fields] OR Large for Gestational Age[all fields] Study selection We included studies that assessed the relationship between maternal serum TG levels during early to late pregnancy and LGA newborn delivery by healthy women or women who had no confounding factors, such as obesity, GDM, type 1 diabetes mellitus (T1DM), type 2 diabetes mellitus (T2DM), intake of medications that can alter lipid levels and maternal obesity. Lipid profiles, including TG, TC, HDL-C, LDL-C and VLDL-C, were measured from healthy pregnant women who had the outcome LGA newborn delivery. We did not include unpublished studies, letter to the editor, commentary, supplementary materials and conference paper. We excluded studies that did not show any relevance or similarity with our study purposes. This study evaluated maternal serum TG levels measured during pregnancy but not pre-conception TG levels. Data extraction and analysis Maternal serum lipid levels in mmol/L and mg/dL were compared between LGA and non-LGA newborns. The study design, study population, method of data collection, gestational age at sampling and serum lipid levels were evaluated for all the selected studies. We measure lipid levels in mmol/l to make them homogenous so all lipid level measurements being reported in mg/dl were converted to mmol/L 12 . The reported mean and standard deviation (SD) values in the selected studies were recorded. However, we found several studies that reported their findings in the form of median and interquartile range; we used a digital calculator to change these into estimated mean and SD 13 . Data abstraction All authors recorded and reviewed the collected articles. The main authors determined the study design, time frame and criteria for the included studies. The other authors helped retrieve the articles and process the data with statistical analyses. We decided to include studies that had prospective and retrospective cohort designs. Statistical methods First, we measured the maternal lipid levels with the standard unit of mmol/L in all included studies; data on maternal lipid levels in mg/dL were converted to mmol/L. Thereafter, we used the Review Manager version 5.3 (RevMan) software designed by Cochrane for statistical analyses. The mean difference and analysed statistical significances of the reported maternal serum lipid levels were calculated and evaluated in terms of impact on the outcome of LGA delivery. I 2 statistics was performed to assess heterogeneity. Results Study characteristics and assessment of risk bias Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. We cross-checked the remaining articles to ensure that original studies were reported. Detailed information on author’s name, publication year, sample size, study design, the determined lipid level and the definitions of LGA was recorded and tabulated in Microsoft Excel 2010 software ( Table 2 and Table 3 ). Table 2. Characteristics of the included studies. Study Study design Year of publication Total number of samples (n) LGA (n) Non- LGA (n) Gestational age at sampling (weeks) LGA definition Biochemical lipid (s) determined Vrijkotte 9 Prospective Cohort 2012 4,008 96 3,912 Singleton pregnancies, first trimester Neonatal birth weight above 90th percentile for gestational age, regardless of sex groups, from the Dutch Perinatal Registration. Non-fasting TC and TG Mitra 14 Prospective Cohort 2012 50 10 40 Singleton pregnancies, third trimester Neonatal birth weight above 90th percentile for gestational age-corrected birth weight curve. TC, TG, HDL, LDL, Parlakgumus 15 Prospective Cohort 2013 411 26 385 Singleton pregnancies, second trimester Neonatal birth weight above 90th percentile for gestational age on Lubchenco growth charts. Fasting TG, VLDL, HDL Harville 16 Prospective Cohort 2014 325 35 290 Singleton pregnancies Neonatal birth weight in the top 10% for gestational age in the study population. Fasting TG Lin Hou 17 Prospective Cohort 2014 2,790 554 2,236 Singleton pregnancies, third trimester Neonatal birth weight above 90th percentile for gestational age based on birth weight percentiles by sex and gestational age in Southern China Fasting TC, HDL-C, LDL-C, TG Kui Ye 18 Prospective Cohort 2015 1204 331 873 Singleton pregnancies, third trimester Neonatal birth weight above 90th percentile for gestational age Fasting TC, TG, HDL- C, LDL-C Wang 3 Retrospective Cohort 2017 5,218 856 4,362 Singleton pregnancies, first trimester Neonatal birth weight above 90th percentile for gestational age based on birth weight percentiles by sex and gestational age in Southern China Non fasting TC, TG, HDL-C, LDL-C Farias 6 Prospective Cohort 2017 188 36 152 Singleton pregnancies, Neonatal birth weight above 90th percentile of the INTERGROWTH-21st curves. Fasting HDL-C, LDL-C, Geraghty 7 Prospective Cohort 2017 327 96 231 singleton pregnancies Neonatal birth weight above 90th percentile of the INTERGROWTH-21st curves. , TG Pazhohan 19 Prospective Cohort 2017 951 248 703 Singleton pregnancies, first trimester Neonatal birth weight above 90th percentile of the INTERGROWTH-21st curves. Fasting TC, HDL-C, LDL-C, TG Liang 4 Prospective Cohort 2018 2,839 2,405 435 Singleton pregnancies Neonatal birth weight above 90th percentile of the INTERGROWTH-21st curves. Fasting TG, Lee 20 Prospective Cohort 2019 623 68 555 Singleton pregnancies, first trimester Neonatal birth weight >90th percentile for gestational age using data derived from Korean population. Fasting TC, TG, HDL- C, LDL-C Table 3. Mean values of lipid profiles during pregnancy in women with LGA newborns and controls. Study LGA vs. Non-LGA Triglyceride (mmol/L) Total cholesterol (mmol/L) HDL-C (mmol/L) LDL-C (mmol/L) VLDL (mmol/L) Vrijkotte 9 LGA 1.44 ± 0.61 5.06 ± 0.91 - - Non-LGA 1.32 ± 0.54 4.98 ± 0.86 - - Mitra 14 a LGA 2.66± 0.88 1.27 ± 0.22 1.7 ± 0.24 2.85 ± 0.25 1.23± 0.43 Non-LGA 2.14± 0.63 1.61 ± 0.42 1.77 ± 0.25 2.95 ± 0.25 1.02 ± 0.31 Parlakgumus 15 * a LGA 1.61± 0.92 3.82 ± 0.85 1.27 ± 0.23 2.2 ± 0.88 0.73 ± 0.41 Non-LGA 1.59± 1.16 4.66 ± 1.83 1.61 ± 0.42 2.85 ± 1.68 0.75 ± 0.50 Harville 16 LGA 1.2 ± 0.7 - - - - Non-LGA 1.1 ± 0.5 - - - - Hou 17 LGA 2.15± 0.52 6.22 ± 0.49 1.70±0.24 2.96 ± 0.44 - Non-LGA 1.23± 0.06 6.33 ± 0.47 1.77±0.25 3.09 ± 0.42 - Wang 3 LGA 1.26 ± 0.68 4.54 ± 0.80 1.71 ± 0.48 2.36 ± 0.68 - Non-LGA 1.10 ± 0.69 4.46 ± 0.80 1.73 ± 0.45 2.30 ± 0.66 - Farias 6 a LGA 4.87 ± 1.91 3.58 ± 2.00 1.27 ± 0.19 2.53 ± 0.41 - Non-LGA 4.32 ± 2.30 3.51 ± 0.2 1.23 ± 0.21 2.49 ± 0.56 - Geraghty 7 LGA 1.86 ± 0.14 - - - - Non-LGA 1.66 ± 0.16 - - - - Pazhohan 18 a LGA 2.27± 1.18 5.23 ± 0.8 - - - Non-LGA 1.82± 0.48 5.08 ± 0.77 - - - Liang 4 LGA 2.15 ± 0.52 - - - - Non-LGA 1.23 ± 0.06 - - - - Lee 20 * a LGA 1.38± 0.19 4.42 ± 0.29 1.62 ± 0.17 2.15 ± 0.20 - Non-LGA 1.26 ± 0.17 4.43 ± 0.26 1.68 ± 0.13 2.17 ± 0.21 - Kui Ye 18 LGA 3.1 ± 1.2 6.6 ± 1.3 2.30 ± 0.5 3.40 ± 0.80 - Non-LGA 2.90 ± 1.2 6.6 ± 1.4 2.40 ± 0.5 3.30 ± 0.80 - *The mean was calculated by inputting the median, lowest range and highest range to the estimating calculator based on SP Hozo 13 . a The data was converted from mg/dL to mmol/L using a standard measuring unit 12 . As shown in Table 2 , the baseline characteristics of the included studies were explained. There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns. Maternal lipid profiles were measured in the first trimester in four articles 3 , 9 , 19 , 20 ; in the second trimester in one article 15 ; in the last trimester in three articles 14 , 17 , 18 and in any of the gestational weeks in the remaining articles 4 , 6 , 7 , 16 . Most of the studies 4 , 6 , 7 , 19 used the INTERGROWTH-21st definition of >90th percentile for LGA newborns. Some studies in China 3 , 17 used a referred percentile standard based on a Chinese population, and some 14 , 16 , 20 used their country’s definition of LGA. A detailed list of the implemented eligibility criteria for each study is shown in Table 2 , and the mean values of the determined biochemical lipids are presented in Table 3 . There were 12 included studies that investigated the effects of lipid profile in pregnant women who had no complications on LGA newborn delivery. The exposures of maternal lipid profile included TG (N = 12), TC (N = 9), HDL-C (N = 7), LDL-C (N = 7) and VLDL-C (N = 2). Based on the analysis of the RevMan tool, we found that the investigated studies that analysed maternal TG, TC, HDL-C and LDL-C had an I 2 of more than 50%; for this reason, we used a random effects model. On the other hand, we used a fixed effect model to assess the studies that investigated maternal VLDL-C, because the I 2 was below 50%. Pregnancy triglyceride samples There were 11 studies that assessed TG levels during pregnancy; 4,761 case subjects and 14,174 control subjects were included. Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies 3 , 19 , 20 . One study reported that maternal serum TG levels in the second trimester were significantly related with the risk for LGA newborns before and after data adjustment 9 . On the other hand, another study on a similar population 15 showed a non-significant correlation between maternal serum TG levels and the risk for LGA newborns. Furthermore, two studies 7 , 17 reported an association between maternal serum TG levels and LGA occurrence. The remaining studies measured TG levels in the first, second and third trimesters and reported significant associations between maternal serum TG levels and the risk for LGA newborns 4 , 7 , 16 . Figure 2 shows the comparison of the mean differences of the included studies. Random effects model meta-analysis showed that the pooled weighted mean difference was 0.28 mmol/L (95% CI −0.02 to 0.54), and significant heterogeneity was observed (Tau² = 0.19; Chi²= 2460.32, I² = 100%, p = 0.03). Figure 2. Forest Plot of Maternal TG level exposure and LGA outcome. Total cholesterol Data on 2,225 patients and 13,218 controls from nine studies 3 , 6 , 9 , 14 , 15 , 17 – 20 were included to evaluate the relationship between TC and LGA newborns. In contrast to all the studies that reported an insignificant association between TC levels and LGA, Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 3 . In fact, some reports were insufficient to prove a significant correlation between TC level and the risk for LGA newborns, whereas other reports found non-significant associations between TC levels and the risk for LGA newborns in the first, second and third trimesters 6 , 17 . Based on the random effects model meta-analysis ( Figure 3 and Table 4 ), the included studies had a pooled weighted mean difference of −0.06 mmol/L (95% CI −0.16 to 0.05) and heterogeneity (Tau 2 = 0.02, Chi² = 65.27, I² = 88%) with p value = 0.26. Figure 3. Forest Plot of Maternal TC exposure and LGA outcome. Table 4. Mean differences in TG, TC, HDL-C, LDL-C and outcome among the LGA newborns. Study Triglyceride Total Cholesterol High-Density Lipoprotein Cholesterol Low-Density Lipoprotein Cholesterol Very Low-Density Lipoprotein Cholesterol Weight % Mean Difference IV, Random, 95% CI Weight % Mean Difference IV, Random, 95% CI Weight % Mean Difference IV, Random, 95% CI Weight % Mean Difference IV, Random, 95% CI Weight % Mean Difference IV, Random, 95% CI Farias 6 5.3 0.55 [-0.17, 1.27] 2.2 0.07 [-0.58, 0.72] 14.2 0.04 [-0.03, -0.11] 12.0 0.04 [-0.12, 0.20] - Not estimable Geraghty 7 9.1 0.20 [0.17, 0.23] - Not estimable - Not estimable - Not estimable Harville 16 8.5 0.10 [-0.14, 0.34] - Not estimable - Not estimable - Not estimable - Not estimable Kui Ye 18 8.9 0.20 [0.05, 0.35] 11.4 0.00 [-0.17, 0.17] 14.9 -0.10 [-0.16, -0.04] 15.7 0.10 [-0.00, 0.20] - Not estimable Lee 20 9.1 0.12 0.07, -0.17] 15.0 -0.01 [-0.08, 0.06] 16.9 -0.06 [-0.10, 0.02] 18.6 --0.02 [-0.07, 0.03] - Not estimable Liang N 4 9.1 0.92 [0.90, 0.94] - Not estimable - Not estimable - Not estimable - Not estimable Lin Hou 17 9.1 0.19 [0.15, 0.23] 15.7 -0.11 [-0.16, -0.06] 18.3 -0.07 [-0.09, -0.05] 19.0 -0.12 [-0.16, -0.08] - Not estimable Mitra 14 6.3 0.46 -0.12, 1.04] 10.6 -0.34 [-0.53, -0.15] 6.6 -0.07 [-0.24, -0.10] 11.2 0.00 [-0.17, 0.17] 25.4 0.21 [-0.07. 0.49] Parlakgumus 15 7.7 0.02 [-0.35, 0.39] 5.3 -0.84 [-1.21, -0.47] 11.6 -0.34 [-0.44, -0.24] 4.8 -0.65 [-1.00, -0.30] 74.6 -0.02 [-0.19, 0.15] Pazohan 19 8.9 0.45 [0.30, 0.60] 13.5 0.15 [0.04, 0.26] - Not estimable - Not estimable - Not estimable Vrijkotte 9 8.9 0.12 [-0.00, 0.24] 10.8 0.08 [-0.10, 0.26] - Not estimable - Not estimable - Not estimable Wang 3 10.0 0.16 [0.11, 0.21] 15.4 0.08 [0.02, 0.14] 17.5 -0.02 [-0.05, 0.01] 18.6 0.06 [0.01, 0.11] - Not estimable Total (95% CI) 100.0 0.28 [0.02, 0.54] 100.0 -0.06 [-0.16, 0.05] 100.0 -0.08 [-0.13, -0.03] 100.0 -0.03 [-0.11, 0.06] - Not estimable High density lipoprotein - cholesterol The analysis of HDL-C and risk for LGA newborns included 1,881 patients and 8,603 controls from seven studies 3 , 6 , 14 , 15 , 17 , 18 , 20 . HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 14 , 18 . In addition, one study found a significant association in the second trimester 6 . On the other hand, one study showed HDL-C as the only lipid that was not significantly related with the birth of LGA infants 3 . Figure 4 and Table 4 show the results of the meta-analysis of the included studies. The pooled weighted mean difference was 0.08 (95% CI −0.13 to −0.03), and heterogeneity was found (Tau 2 = 0.00, Chi² = 46.53, I² = 87%), with p = 0.003. Figure 4. Forest Plot of Maternal HDL-C exposure and LGA outcome. Low density lipoprotein - cholesterol Six of the included studies 3 , 6 , 14 , 15 , 17 , 18 , 20 , which recruited 1,881 patients and 8,603 controls, majority reported no significant correlations between LDL-C concentration and LGA newborns as a neonatal outcome. On the other hand, four studies 3 , 6 , 15 , 20 showed that LDL-C concentration was associated with LGA newborns. This association was found during the second and third trimesters of pregnancy 6 . Furthermore, the study by Wang supported this association by showing that LDL-C concentrations played a significant role in the risk for LGA newborns and that three lipids (TG, TC and LDL-C) were significant contributing factors 3 . Figure 5 and Table 4 show that the pooled weight mean difference was −0.03 (95% CI −0.11 to 0.06) and that heterogeneity was found (Tau 2 = 0.01, Chi² = 50.91, I² = 88%), with p = 0.56. Figure 5. Forest Plot of Maternal LDL-C exposure and LGA outcome. Very low density lipoprotein - cholesterol Studies and available information on the impact of VLDL on LGA remain unclear. Nevertheless, two studies that included a total of 36 patients and 425 controls reported that there was no correlation between VLDL and LGA newborns 14 , 15 . Based on our meta-analysis, the level of maternal serum VLDL was not significantly associated with births of LGA newborns (p = 0.60) ( Figure 6 ). Figure 6. Forest Plot of Maternal VLDL exposure and LGA outcome. Discussion Data from 12 published articles were evaluated in this systematic review to determine the relationship between lipid values measured during pregnancy and the risk for LGA newborns. Our review presented some valuable findings. We discovered that TC levels were inconsistent in both groups of women who delivered LGA and non-LGA newborns. This finding suggested that TC level as a determinant of LGA newborn delivery is clinically not useful. In support of this result, almost all studies reported that TC levels were similar across the groups. In addition, Parlakgumus 15 reported that TC levels in the second trimester took a decisive role on the risk for LGA newborns, compared with the results of many studies. Many of the studies reported increase in TG levels in women who delivered LGA newborns. Our meta-analysis concluded that maternal TG levels were significantly elevated in women who would deliver LGA neonates. Moreover, maternal HDL-C levels were lower in women with LGA newborns than in those with non-LGA newborns. Therefore, a low level of maternal HDL-C concentration was significantly associated with the risk for LGA newborns. Levels of maternal LDL-C had no significant weight on women who had LGA newborns. Therefore, LDL-C and VLDL-C levels were not significant causative factors of LGA outcomes in pregnant women who had no comorbidities. Exclusion of all confounding factors, such as T1DM, T2DM, GDM, maternal obesity and excessive gestational weight gain (GWG), which can affect the increased risk for LGA newborns in women who had abnormal lipid profiles, was important. A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns 21 . Similarly, a retrospective cohort study by Lisa et al. showed considerably higher rates of LGA newborns in women with T1DM (39%) than in women with T2DM (17%); their multivariate analysis on non-Caucasian women demonstrated an increased risk for LGA newborns in women who had T1DM (OR = 4.07; 95% CI 1.46 to 11.35) and T2DM (OR = 2.47; 95% CI 1.15 to 5.32) 22 . A reported study on 175 women with T1DM in the United States discovered similar rates of LGA newborn delivery in women who had HbA1C of >6.5% and <6.5%, suggesting the likelihood of T1DM as a contributing factor 23 . A cohort study on multi-ethnic groups revealed that GDM and relatively high pregnancy BMI were linked with an increased risk for LGA newborn delivery. The prevalence of LGA newborns among women with GDM was highest in African, American and Hispanic women and lowest in Asian, Filipino and White women 24 . In another study on GDM, women who had elevated fasting plasma glucose levels were at a relatively high risk for having LGA newborns 25 . An analysis of 23,000 women in the Hyperglycaemia and Adverse Pregnancy Outcomes study discovered that the macrosomia prevalence in non-obese women was 6.7% in 1,244 patients without GDM and 10.2% in 2,791 patients with GDM. The investigators found that the frequency of macrosomia was 50% higher in women with GDM than in women without GDM in both the non-obese and obese groups 26 . Moreover, abnormal pre-pregnancy BMI significantly increased the risk for LGA neonates. A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition 27 . Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels 28 . Our review could not exclude women with excessive GWG, because this was not reported in the majority of the included studies. Therefore, we assumed that excessive GWG may have affected our results. Some studies showed that excessive GWG in pregnant women who had no complications increased the risk for delivering LGA newborn; compared with women who had uncomplicated pregnancies, those who exceeded the GWG recommendation had three and six times higher risk for macrosomia births 29 . The expected association of pre-pregnancy BMI and GWG with maternal and foetal outcomes showed that GWG of >16 kg led to an increased risk for delivering LGA neonates 30 . A study by Lu et al. reported that high second trimester GWG was significantly related with a relatively high risk for LGA newborns 31 . The probability of giving birth to an LGA newborn increased by 6.9% per kilogram of maternal weight gain, and the odds ratio was 1.249 for GWG beyond the recommended amount 32 . Similarly, another study found that the odds ratio for delivering LGA newborns was higher for non-diabetic Caucasian women with BMIs 25 than in women with GDM and normal BMIs 33 . Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range 34 , 35 . As one of the most simple blood measurements, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels 36 , 37 Moreover, maternal lipid profiles are not only informative to predict neonatal outcomes, but also tends to be important information that is integral to pregnant women’s metabolic status, including act as a potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester 38 . Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin 39 . These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders. Strengths and limitations This review was the first to directly address the association between maternal lipid profiles and the risk for LGA newborns, without any confounding factors. However, it had several weaknesses. First, this review depended on the design and quality of the included studies, regardless of the baseline lipid level, which was crucial to the results of our meta-analysis. Second, our meta-analysis did not distinguish pregnant women based on trimester of pregnancy but described the effects of physiologic changes in lipid metabolism on pregnant women and the risk for LGA newborns throughout the entire pregnancy; it did not consider the confounding factors that may occur in different trimesters. We assumed that our review results might not be sufficient to meet our expectations. Therefore, all of these reasons became researcher biases, which may have resulted in our findings. Future studies Most of the existing observational studies cannot be used to predict the definitive value of the independent contribution of lipid levels to maternal and neonatal outcomes because of the unmeasured confounding factors and methodological limitations. We recommend that future studies analyse women separately based on their non-modifiable characteristics, such as maternal age, race and inherited disorders. Furthermore, we noticed that these observational studies did not exclude women who had excessive GWG, which can contribute to the risk for LGA newborns. Future observational studies must include details on maternal lifestyles and environment to minimise population bias. Conclusions In conclusion, this review demonstrated notable findings from studies on the associations between maternal lipid levels and risk for LGA newborns. Our meta-analysis emphasised that high levels of TG and low levels of HDL-C may affect foetal development and cause births of LGA newborns. On the other hand, maternal serum of TC, LDL-C and VLDL-C cannot be used as predictor of LGA without the other risk factors, such as excessive GWG and insulin resistance. However, we need a better understanding of the relative contributions of other confounding factors, such as gestational age at sampling, maternal age and excessive GWG. We acknowledge that we used exclusion criteria, such as T1DM, T2DM, obesity and hypertension. Excessive GWG was not an exclusion criterion because of the limited amount of studies that excluded such population of women, although we were aware that it may contribute to LGA newborn delivery in healthy women. Data availability Underlying data Figshare: Underlying Data - Maternal Lipid Levels on Pregnant Women without Complication in Developing Risk of Large for Gestational Age Newborn: Meta-Analysis study, https://doi.org/10.6084/m9.figshare.13011941.v2 40 . Reporting guidelines Figshare: PRISMA checklist for ‘Maternal Lipid Levels on Pregnant Women without Complication in Developing Risk of Large for Gestational Age Newborn: Meta-Analysis study’, https://doi.org/10.6084/m9.figshare.13011803.v2 11 . Data are available under the terms of the Creative Commons Attribution 4.0 International license (CC-BY 4.0). Faculty Opinions recommended References 1. Heerwagen MJR, Miller MR, Barbour LA, et al. : Maternal obesity and fetal metabolic programming: a fertile epigenetic soil. Am J Physiol Regul Integr Comp Physiol. 2010; 299 (3): R711–22. PubMed Abstract | Publisher Full Text | Free Full Text 2. Wang J, Moore D, Subramanian A, et al. : Gestational dyslipidaemia and adverse birthweight outcomes: a systematic review and meta-analysis. Obes Rev. 2018; 19 (9): 1256–68. PubMed Abstract | Publisher Full Text 3. Wang C, Zhu W, Wei Y, et al. : The associations between early pregnancy lipid profiles and pregnancy outcomes. 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PubMed Abstract | Publisher Full Text 23. Scifres CM, Feghali MN, Althouse AD, et al. : Effect of excess gestational weight gain on pregnancy outcomes in women with type 1 diabetes. Obstet Gynecol. 2014; 123 (6): 1295–302. PubMed Abstract | Publisher Full Text 24. Sridhar SB, Ferrara A, Ehrlich SF, et al. : Risk of large-for-gestational-age newborns in women with gestational diabetes by race and ethnicity and body mass index categories. Obstet Gynecol. 2013; 121 (6): 1255–62. PubMed Abstract | Publisher Full Text | Free Full Text 25. Ryan EA, Savu A, Yeung RO, et al. : Elevated fasting vs post-load glucose levels and pregnancy outcomes in gestational diabetes: a population-based study. Diabet Med. 2020; 37 (1): 114–22. PubMed Abstract | Publisher Full Text 26. Szmuilowicz ED, Josefson JL, Metzger BE: Gestational Diabetes Mellitus. Endocrinol Metab Clin North Am. 2019; 48 (3): 479–93. PubMed Abstract | Publisher Full Text | Free Full Text 27. Göbl CS, Handisurya A, Klein K, et al. : Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes Care. 2010; 33 (9): 2071–3. PubMed Abstract | Publisher Full Text | Free Full Text 28. Kitajima M, Oka S, Yasuhi I, et al. : Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstet Gynecol. 2001; 97 (5 Pt 1): 776–780. PubMed Abstract | Publisher Full Text 29. Ferraro ZM, Barrowman N, Prud’homme D, et al. : Excessive gestational weight gain predicts large for gestational age neonates independent of maternal body mass index. J Matern Neonatal Med. 2012; 25 (5): 538–42. PubMed Abstract | Publisher Full Text 30. Nohr EA, Vaeth M, Baker JL, et al. : Combined associations of prepregnancy body mass index and gestational weight gain with the outcome of pregnancy. Am J Clin Nutr. 2008; 88 (6): 1705. PubMed Abstract | Publisher Full Text 31. Lu W, Zhang X, Wu J, et al. : Association between trimester-specific gestational weight gain and childhood obesity at 5 years of age: Results from Shanghai obesity cohort. BMC Pediatr. 2019; 19 (1): 139. PubMed Abstract | Publisher Full Text | Free Full Text 32. Weschenfelder F, Lehmann T, Schleussner E, et al. : Gestational Weight Gain Particularly Affects the Risk of Large for Gestational Age Infants in Non-obese Mothers. Geburtshilfe Frauenheilkd. 2019; 79 (11): 1183–90. PubMed Abstract | Publisher Full Text | Free Full Text 33. Kim SY, Sharma AJ, Sappenfield W, et al. : Association of maternal body mass index, excessive weight gain, and gestational diabetes mellitus with large-for-gestational-age births. Obstet Gynecol. 2014; 123 (4): 737–44. PubMed Abstract | Publisher Full Text | Free Full Text 34. Couillard C, Després JP, Lamarche B, et al. : Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics (HERITAGE) Family Study. Arterioscler Thromb Vasc Biol. 2001; 21 (7): 1226–32. PubMed Abstract | Publisher Full Text 35. Larrydurstine J, Haskell WL: Effects of exercise training on plasma lipids and lipoproteins. Exerc Sport Sci Rev. 1994; 22 : 477–522. PubMed Abstract 36. Butler CL, Williams MA, Sorensen TK, et al. : Relation between maternal recreational physical activity and plasma lipids in early pregnancy. Am J Epidemiol. 2004; 160 (4): 350–9. PubMed Abstract | Publisher Full Text 37. Williams MA, Frederick IO, Qiu C, et al. : Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clin Biochem. 2006; 39 (11): 1063–70. PubMed Abstract | Publisher Full Text | Free Full Text 38. Correa PJ, Venegas P, Palmeiro Y, et al. : First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. J Perinat Med. 2019; 47 (2): 161–8. PubMed Abstract | Publisher Full Text 39. Li G, Kong L, Zhang L, et al. : Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reprod Sci. 2015; 22 (6): 712–7. PubMed Abstract | Publisher Full Text | Free Full Text 40. Muhammad Pradhiki M, Mahendra Tri Arif S, Muhammad Pradhika M, et al. : Underlying Data - Maternal Lipid Levels on Pregnant Women Without Complication in Developing Risk of Large for Gestational Age Newborn: Meta-Analysis study. figshare. Dataset. 2020. http://www.doi.org/10.6084/m9.figshare.13011941.v2 Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 08 Oct 2020 ADD YOUR COMMENT Comment Author details Author details 1 Faculty of Medicine, Hasanuddin University, Makassar, South Sulawesi, 90245, Indonesia 2 Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, East Java, 60115, Indonesia 3 Faculty of Medicine, University of Sebelas Maret, Surakarta, Central Java, 57126, Indonesia Muhammad Pradhiki Mahindra Roles: Conceptualization, Data Curation, Formal Analysis, Methodology, Software, Writing – Original Draft Preparation, Writing – Review & Editing Mahendra Tri Arif Sampurna Roles: Funding Acquisition, Methodology, Project Administration, Supervision, Writing – Review & Editing Muhammad Pradhika Mapindra Roles: Formal Analysis, Funding Acquisition, Investigation, Project Administration, Resources, Writing – Original Draft Preparation, Writing – Review & Editing Apriska Mega Sutowo Putri Roles: Investigation, Resources, Software, Visualization, Writing – Original Draft Preparation, Writing – Review & Editing Competing interests No competing interests were disclosed. Grant information The author(s) declared that no grants were involved in supporting this work. Article Versions (2) version 2 Revised Published: 29 Jan 2021, 9:1213 https://doi.org/10.12688/f1000research.26072.2 version 1 Published: 08 Oct 2020, 9:1213 https://doi.org/10.12688/f1000research.26072.1 Copyright © 2021 Mahindra MP et al . This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Download Export To Sciwheel Bibtex EndNote ProCite Ref. Manager (RIS) Sente metrics Views Downloads F1000Research - - PubMed Central info_outline Data from PMC are received and updated monthly. - - Citations open_in_new 0 open_in_new 0 open_in_new SEE MORE DETAILS CITE how to cite this article Mahindra MP, Sampurna MTA, Mapindra MP and Sutowo Putri AM. Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.12688/f1000research.26072.2 ) NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS track receive updates on this article Track an article to receive email alerts on any updates to this article. TRACK THIS ARTICLE Share Open Peer Review Current Reviewer Status: ? Key to Reviewer Statuses VIEW HIDE Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Version 2 VERSION 2 PUBLISHED 29 Jan 2021 Revised Views 0 Cite How to cite this report: Liem KD. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.35486.r78460 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v2#referee-response-78460 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 12 Feb 2021 Kian Djien Liem , Department of Neonatology, Radboud University Medical Center, Nijmegen, The Netherlands Approved VIEWS 0 https://doi.org/10.5256/f1000research.35486.r78460 The authors have made adequate changes in the manuscript as suggested. The mistakes have been corrected. ... Continue reading READ ALL The authors have made adequate changes in the manuscript as suggested. The mistakes have been corrected. They have made a recommendation for the clinical practise concerning the lipid level of pregnant women. Competing Interests: No competing interests were disclosed. Reviewer Expertise: neonatal medicine I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Liem KD. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.35486.r78460 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v2#referee-response-78460 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Respond or Comment COMMENT ON THIS REPORT Version 1 VERSION 1 PUBLISHED 08 Oct 2020 Views 0 Cite How to cite this report: Rajadurai VS. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72781 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72781 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 21 Dec 2020 Victor Samuel Rajadurai , Department of Neonatology, KK Women's and Children's Hospital, Singapore, Singapore Approved VIEWS 0 https://doi.org/10.5256/f1000research.28773.r72781 The authors have done a systematic review of the influence of lipid levels in pregnant women and their effect on the developing fetus particularly, large for gestational age (LGA). The review has clearly addressed the rationale for the review, objectives, ... Continue reading READ ALL The authors have done a systematic review of the influence of lipid levels in pregnant women and their effect on the developing fetus particularly, large for gestational age (LGA). The review has clearly addressed the rationale for the review, objectives, characteristics of the participants and outcomes. Sufficient details of the search criteria, methods, inclusion & exclusion criteria and details of the data collection have been clearly defined. Standard statistical methods, applications and interpretations have been used. The conclusions are valid and supported by the results. Suggested the following changes: Low levels of HDL Cholesterol may reflect the life style, lack of exercise and relative inactivity of the women included in the articles. Sufficient information regarding this has not been mentioned in the papers included. (To discuss in detail in a separate paragraph). Under “strengths and Limitations”: I would suggest to delete, the third mentioned limitation as this has already been discussed under inclusion criteria. It would be good to discuss whether increased TG levels in the absence of overt GDM or established DM (Type 1 & 2) could be a marker of pre-diabetics in some women who give birth to LGA babies. Are the rationale for, and objectives of, the Systematic Review clearly stated? Yes Are sufficient details of the methods and analysis provided to allow replication by others? Yes Is the statistical analysis and its interpretation appropriate? Yes Are the conclusions drawn adequately supported by the results presented in the review? Yes Competing Interests: No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Rajadurai VS. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72781 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72781 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency ... Continue reading 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range (1,2). 2. Thank you very much for your corrections. We would like to delete the statement as you suggested. 3. Thank you very much for your suggestion, we have added the informative statement as you suggested in the discussion section. “Maternal lipid profiles are reported as the potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester (3). Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin (4). These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders.” References: (1) (1) C, Després JP, Lamarche B, Bergeron J, Gagnon J, Leon AS, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics PLEASE NOTE If you are an AUTHOR of this article, please check that you signed in with the account associated with this article otherwise we cannot automatically identify your role as an author and your comment will be labelled as a “User Comment”. If you are a REVIEWER of this article, please check that you have signed in with the account associated with this article and then go to your account to submit your report, please do not post your review here. If you do not have access to your original account, please contact us . User comments must be in English, comprehensible and relevant to the article under discussion. We reserve the right to remove any comments that we consider to be inappropriate, offensive or otherwise in breach of the User Comment Terms and Conditions . Commenters must not use a comment for personal attacks. When criticisms of the article are based on unpublished data, the data should be made available. (HERITAGE) Family Study. Arteriosclerosis, thrombosis, and vascular biology. 2001 Jul;21(7):1226-32. (2) Larrydurstine J, Haskell WL. Effects of exercise training on plasma lipids and lipoproteins. Exercise and sport sciences reviews. 1994 Jan 1;22(1):477-522. References : (3) Correa PJ, Venegas P, Palmeiro Y, Albers D, Rice G, Roa J, Cortez J, Monckeberg M, Schepeler M, Osorio E, Illanes SE. First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. Journal of perinatal medicine. 2019 Feb 25;47(2):161-8. (4) Li G, Kong L, Zhang L, Fan L, Su Y, Rose JC, Zhang W. Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reproductive Sciences. 2015 Jun;22(6):712-7. 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range (1,2). 2. Thank you very much for your corrections. We would like to delete the statement as you suggested. 3. Thank you very much for your suggestion, we have added the informative statement as you suggested in the discussion section. “Maternal lipid profiles are reported as the potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester (3). Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin (4). These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders.” References: (1) (1) C, Després JP, Lamarche B, Bergeron J, Gagnon J, Leon AS, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics PLEASE NOTE If you are an AUTHOR of this article, please check that you signed in with the account associated with this article otherwise we cannot automatically identify your role as an author and your comment will be labelled as a “User Comment”. If you are a REVIEWER of this article, please check that you have signed in with the account associated with this article and then go to your account to submit your report, please do not post your review here. If you do not have access to your original account, please contact us . User comments must be in English, comprehensible and relevant to the article under discussion. We reserve the right to remove any comments that we consider to be inappropriate, offensive or otherwise in breach of the User Comment Terms and Conditions . Commenters must not use a comment for personal attacks. When criticisms of the article are based on unpublished data, the data should be made available. (HERITAGE) Family Study. Arteriosclerosis, thrombosis, and vascular biology. 2001 Jul;21(7):1226-32. (2) Larrydurstine J, Haskell WL. Effects of exercise training on plasma lipids and lipoproteins. Exercise and sport sciences reviews. 1994 Jan 1;22(1):477-522. References : (3) Correa PJ, Venegas P, Palmeiro Y, Albers D, Rice G, Roa J, Cortez J, Monckeberg M, Schepeler M, Osorio E, Illanes SE. First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. Journal of perinatal medicine. 2019 Feb 25;47(2):161-8. (4) Li G, Kong L, Zhang L, Fan L, Su Y, Rose JC, Zhang W. Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reproductive Sciences. 2015 Jun;22(6):712-7. Competing Interests: No competing interests were disclosed Close Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening ... Continue reading Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening process in Figure 1. We have edited these mistakes and replaced the Figure 1, attached on the revised file "Our search retrieved 649 articles, 147 of which wereindependently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text". . 2. Thank you for your correction. We changed it into: “ We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 3. Thank you for your correction. We changed it into “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included" 4. Thank you for your comment. Actually, this sentence is a mistake and not informative. We decided to delete it because it did not imply our study results 5. Thank you for your comment. We changed it into : "Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants studies” 6. Thank you for your comments. Due to mistyping, we changed it according to your suggestion " HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants" Discussion Section 7. Thank you for your comments. We would like to change the confusing sentences : "A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns". 8. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). 9. Thank you for your suggestion. We added useful information to support our study and put it in disucssion section. "A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (3). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (4). References : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. (3) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (4) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780 Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening process in Figure 1. We have edited these mistakes and replaced the Figure 1, attached on the revised file "Our search retrieved 649 articles, 147 of which wereindependently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text". . 2. Thank you for your correction. We changed it into: “ We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 3. Thank you for your correction. We changed it into “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included" 4. Thank you for your comment. Actually, this sentence is a mistake and not informative. We decided to delete it because it did not imply our study results 5. Thank you for your comment. We changed it into : "Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants studies” 6. Thank you for your comments. Due to mistyping, we changed it according to your suggestion " HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants" Discussion Section 7. Thank you for your comments. We would like to change the confusing sentences : "A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns". 8. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). 9. Thank you for your suggestion. We added useful information to support our study and put it in disucssion section. "A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (3). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (4). References : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. (3) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (4) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780 Competing Interests: No competing interests were disclosed Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency ... Continue reading 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range (1,2). 2. Thank you very much for your corrections. We would like to delete the statement as you suggested. 3. Thank you very much for your suggestion, we have added the informative statement as you suggested in the discussion section. “Maternal lipid profiles are reported as the potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester (3). Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin (4). These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders.” References: (1) (1) C, Després JP, Lamarche B, Bergeron J, Gagnon J, Leon AS, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics PLEASE NOTE If you are an AUTHOR of this article, please check that you signed in with the account associated with this article otherwise we cannot automatically identify your role as an author and your comment will be labelled as a “User Comment”. If you are a REVIEWER of this article, please check that you have signed in with the account associated with this article and then go to your account to submit your report, please do not post your review here. If you do not have access to your original account, please contact us . User comments must be in English, comprehensible and relevant to the article under discussion. We reserve the right to remove any comments that we consider to be inappropriate, offensive or otherwise in breach of the User Comment Terms and Conditions . Commenters must not use a comment for personal attacks. When criticisms of the article are based on unpublished data, the data should be made available. (HERITAGE) Family Study. Arteriosclerosis, thrombosis, and vascular biology. 2001 Jul;21(7):1226-32. (2) Larrydurstine J, Haskell WL. Effects of exercise training on plasma lipids and lipoproteins. Exercise and sport sciences reviews. 1994 Jan 1;22(1):477-522. References : (3) Correa PJ, Venegas P, Palmeiro Y, Albers D, Rice G, Roa J, Cortez J, Monckeberg M, Schepeler M, Osorio E, Illanes SE. First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. Journal of perinatal medicine. 2019 Feb 25;47(2):161-8. (4) Li G, Kong L, Zhang L, Fan L, Su Y, Rose JC, Zhang W. Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reproductive Sciences. 2015 Jun;22(6):712-7. 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range (1,2). 2. Thank you very much for your corrections. We would like to delete the statement as you suggested. 3. Thank you very much for your suggestion, we have added the informative statement as you suggested in the discussion section. “Maternal lipid profiles are reported as the potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester (3). Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin (4). These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders.” References: (1) (1) C, Després JP, Lamarche B, Bergeron J, Gagnon J, Leon AS, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics PLEASE NOTE If you are an AUTHOR of this article, please check that you signed in with the account associated with this article otherwise we cannot automatically identify your role as an author and your comment will be labelled as a “User Comment”. If you are a REVIEWER of this article, please check that you have signed in with the account associated with this article and then go to your account to submit your report, please do not post your review here. If you do not have access to your original account, please contact us . User comments must be in English, comprehensible and relevant to the article under discussion. We reserve the right to remove any comments that we consider to be inappropriate, offensive or otherwise in breach of the User Comment Terms and Conditions . Commenters must not use a comment for personal attacks. When criticisms of the article are based on unpublished data, the data should be made available. (HERITAGE) Family Study. Arteriosclerosis, thrombosis, and vascular biology. 2001 Jul;21(7):1226-32. (2) Larrydurstine J, Haskell WL. Effects of exercise training on plasma lipids and lipoproteins. Exercise and sport sciences reviews. 1994 Jan 1;22(1):477-522. References : (3) Correa PJ, Venegas P, Palmeiro Y, Albers D, Rice G, Roa J, Cortez J, Monckeberg M, Schepeler M, Osorio E, Illanes SE. First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. Journal of perinatal medicine. 2019 Feb 25;47(2):161-8. (4) Li G, Kong L, Zhang L, Fan L, Su Y, Rose JC, Zhang W. Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reproductive Sciences. 2015 Jun;22(6):712-7. Competing Interests: No competing interests were disclosed Close Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening ... Continue reading Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening process in Figure 1. We have edited these mistakes and replaced the Figure 1, attached on the revised file "Our search retrieved 649 articles, 147 of which wereindependently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text". . 2. Thank you for your correction. We changed it into: “ We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 3. Thank you for your correction. We changed it into “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included" 4. Thank you for your comment. Actually, this sentence is a mistake and not informative. We decided to delete it because it did not imply our study results 5. Thank you for your comment. We changed it into : "Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants studies” 6. Thank you for your comments. Due to mistyping, we changed it according to your suggestion " HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants" Discussion Section 7. Thank you for your comments. We would like to change the confusing sentences : "A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns". 8. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). 9. Thank you for your suggestion. We added useful information to support our study and put it in disucssion section. "A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (3). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (4). References : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. (3) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (4) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780 Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening process in Figure 1. We have edited these mistakes and replaced the Figure 1, attached on the revised file "Our search retrieved 649 articles, 147 of which wereindependently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text". . 2. Thank you for your correction. We changed it into: “ We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 3. Thank you for your correction. We changed it into “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included" 4. Thank you for your comment. Actually, this sentence is a mistake and not informative. We decided to delete it because it did not imply our study results 5. Thank you for your comment. We changed it into : "Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants studies” 6. Thank you for your comments. Due to mistyping, we changed it according to your suggestion " HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants" Discussion Section 7. Thank you for your comments. We would like to change the confusing sentences : "A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns". 8. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). 9. Thank you for your suggestion. We added useful information to support our study and put it in disucssion section. "A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (3). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (4). References : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. (3) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (4) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780 Competing Interests: No competing interests were disclosed Close Report a concern COMMENT ON THIS REPORT Views 0 Cite How to cite this report: Liem KD. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72787 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72787 NOTE: it is important to ensure the information in square brackets after the title is included in this citation. Close Copy Citation Details Reviewer Report 03 Nov 2020 Kian Djien Liem , Department of Neonatology, Radboud University Medical Center, Nijmegen, The Netherlands Approved with Reservations VIEWS 0 https://doi.org/10.5256/f1000research.28773.r72787 General comments This is a well-written manuscript. The authors have tried to explore the relationships between maternal lipid levels and the risk of having a large for gestational age (LGA) offspring using a systematic review. The results are of ... Continue reading READ ALL General comments This is a well-written manuscript. The authors have tried to explore the relationships between maternal lipid levels and the risk of having a large for gestational age (LGA) offspring using a systematic review. The results are of great importance for the obstetricians to be aware of the risk factors for developing LGA newborns. With this knowledge of the risk factors, they can take measures in the pregnant woman to prevent LGA newborns. LGA should be avoided as much as possible, since it is a risk factor for developing metabolic syndrome in adult life. The authors have demonstrated that there is an association between maternal lipid levels and risk for LGA newborns, especially high levels TG and low levers HDL-C. But they don’t make any recommendation what we should do for the pregnant women in order to prevent LGA of their offspring’s. Should we determine the lipid level as a routine during pregnancy? But determination of lipid levels during pregnancy could be too late, especially when this is abnormal. Therefore should we give more attention in pre-conception care and recommend normalization of lipid levels, before the women become pregnant? I would like to challenge the authors to make some discussion on the topic about what would be the consequences of their finding. Specific comments Introduction: No comments Methods: No comments Results: Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90 th percentile? But this is different than LGA. Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Page 7, under Total cholesterol. It is mentioned: “Wang reported that abnormal levels of maternal TC were significantly associated with the event of LGA delivery in the first trimester”. What do the authors mean with the event of LGA delivery in the first trimester. Does it mean miscarriage of a foetus, with a body weight > 90th percentile for the gestational age? Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Discussion Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90 th percentile at 26 and 34 weeks age of gestation? Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Are the rationale for, and objectives of, the Systematic Review clearly stated? Yes Are sufficient details of the methods and analysis provided to allow replication by others? Yes Is the statistical analysis and its interpretation appropriate? Yes Are the conclusions drawn adequately supported by the results presented in the review? Partly Competing Interests: No competing interests were disclosed. Reviewer Expertise: neonatal medicine I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above. Close READ LESS CITE CITE HOW TO CITE THIS REPORT Liem KD. Reviewer Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72787 ) The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72787 NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article. COPY CITATION DETAILS Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could ... Continue reading Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). Reference : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). Reference : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. Competing Interests: No competing interests were disclosed. Close Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the ... Continue reading Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Answers : We would like to apologize because of several mistakes about the article screening process in Figure 1. we would also intend to edit the Figure 1. Regarding the statement, we would revise our statement as follows : Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 2. Results section, Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90th percentile? But this is different than LGA. Answers : Thank you for your correction. We changed the confusing statement to : “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies” 3. Results section, Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Answers : Thank you very much for your corrections. Actually, this sentence is a mistake and not informative statement. We decided to delete it because it did not imply our study results 4. Results section, Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Answers : Thank you for your comment and corrections We would like to change the confusing statement to : Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 5. Results section, Page 7 under High density lipoprotein – cholesterol. We mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. Answers : Thank you for your corrections. We would like to vhange the statement to : HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 6. Discussion Section, Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation ”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90th percentile at 26 and 34 weeks age of gestation? Answers : Thank you for the corrections. We would like to apologize for confusing statement. We would like to changed it to : A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns. 7. Discussion section, Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Answers : Thank you ver much for your suggestion. We would like to add useful information to support our study : A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (1). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (2). Reference : (1) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (2) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780. Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Answers : We would like to apologize because of several mistakes about the article screening process in Figure 1. we would also intend to edit the Figure 1. Regarding the statement, we would revise our statement as follows : Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 2. Results section, Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90th percentile? But this is different than LGA. Answers : Thank you for your correction. We changed the confusing statement to : “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies” 3. Results section, Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Answers : Thank you very much for your corrections. Actually, this sentence is a mistake and not informative statement. We decided to delete it because it did not imply our study results 4. Results section, Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Answers : Thank you for your comment and corrections We would like to change the confusing statement to : Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 5. Results section, Page 7 under High density lipoprotein – cholesterol. We mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. Answers : Thank you for your corrections. We would like to vhange the statement to : HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 6. Discussion Section, Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation ”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90th percentile at 26 and 34 weeks age of gestation? Answers : Thank you for the corrections. We would like to apologize for confusing statement. We would like to changed it to : A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns. 7. Discussion section, Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Answers : Thank you ver much for your suggestion. We would like to add useful information to support our study : A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (1). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (2). Reference : (1) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (2) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780. Competing Interests: No competing interests were disclosed. Close Report a concern Respond or Comment COMMENTS ON THIS REPORT Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could ... Continue reading Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). Reference : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). Reference : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. Competing Interests: No competing interests were disclosed. Close Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna , Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 29 Jan 2021 Author Response Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the ... Continue reading Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Answers : We would like to apologize because of several mistakes about the article screening process in Figure 1. we would also intend to edit the Figure 1. Regarding the statement, we would revise our statement as follows : Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 2. Results section, Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90th percentile? But this is different than LGA. Answers : Thank you for your correction. We changed the confusing statement to : “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies” 3. Results section, Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Answers : Thank you very much for your corrections. Actually, this sentence is a mistake and not informative statement. We decided to delete it because it did not imply our study results 4. Results section, Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Answers : Thank you for your comment and corrections We would like to change the confusing statement to : Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 5. Results section, Page 7 under High density lipoprotein – cholesterol. We mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. Answers : Thank you for your corrections. We would like to vhange the statement to : HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 6. Discussion Section, Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation ”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90th percentile at 26 and 34 weeks age of gestation? Answers : Thank you for the corrections. We would like to apologize for confusing statement. We would like to changed it to : A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns. 7. Discussion section, Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Answers : Thank you ver much for your suggestion. We would like to add useful information to support our study : A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (1). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (2). Reference : (1) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (2) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780. Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Answers : We would like to apologize because of several mistakes about the article screening process in Figure 1. we would also intend to edit the Figure 1. Regarding the statement, we would revise our statement as follows : Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 2. Results section, Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90th percentile? But this is different than LGA. Answers : Thank you for your correction. We changed the confusing statement to : “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies” 3. Results section, Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Answers : Thank you very much for your corrections. Actually, this sentence is a mistake and not informative statement. We decided to delete it because it did not imply our study results 4. Results section, Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Answers : Thank you for your comment and corrections We would like to change the confusing statement to : Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 5. Results section, Page 7 under High density lipoprotein – cholesterol. We mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. Answers : Thank you for your corrections. We would like to vhange the statement to : HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 6. Discussion Section, Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation ”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90th percentile at 26 and 34 weeks age of gestation? Answers : Thank you for the corrections. We would like to apologize for confusing statement. We would like to changed it to : A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns. 7. Discussion section, Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Answers : Thank you ver much for your suggestion. We would like to add useful information to support our study : A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (1). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (2). Reference : (1) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (2) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780. Competing Interests: No competing interests were disclosed. Close Report a concern COMMENT ON THIS REPORT Comments on this article Comments (0) Version 2 VERSION 2 PUBLISHED 08 Oct 2020 ADD YOUR COMMENT Comment keyboard_arrow_left keyboard_arrow_right Open Peer Review Reviewer Status info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions Reviewer Reports Invited Reviewers 1 2 Version 2 (revision) 29 Jan 21 read Version 1 08 Oct 20 read read Kian Djien Liem , Radboud University Medical Center, Nijmegen, The Netherlands Victor Samuel Rajadurai , KK Women's and Children's Hospital, Singapore, Singapore Comments on this article All Comments (0) Add a comment Sign up for content alerts Sign Up You are now signed up to receive this alert Browse by related subjects keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2021 Liem K. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 12 Feb 2021 | for Version 2 Kian Djien Liem , Department of Neonatology, Radboud University Medical Center, Nijmegen, The Netherlands 0 Views copyright © 2021 Liem K. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (0) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The authors have made adequate changes in the manuscript as suggested. The mistakes have been corrected. They have made a recommendation for the clinical practise concerning the lipid level of pregnant women. Competing Interests No competing interests were disclosed. Reviewer Expertise neonatal medicine I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (0) Liem KD. Peer Review Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.35486.r78460) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/9-1213/v2#referee-response-78460 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2020 Rajadurai V. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 21 Dec 2020 | for Version 1 Victor Samuel Rajadurai , Department of Neonatology, KK Women's and Children's Hospital, Singapore, Singapore 0 Views copyright © 2020 Rajadurai V. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (2) Approved info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions The authors have done a systematic review of the influence of lipid levels in pregnant women and their effect on the developing fetus particularly, large for gestational age (LGA). The review has clearly addressed the rationale for the review, objectives, characteristics of the participants and outcomes. Sufficient details of the search criteria, methods, inclusion & exclusion criteria and details of the data collection have been clearly defined. Standard statistical methods, applications and interpretations have been used. The conclusions are valid and supported by the results. Suggested the following changes: Low levels of HDL Cholesterol may reflect the life style, lack of exercise and relative inactivity of the women included in the articles. Sufficient information regarding this has not been mentioned in the papers included. (To discuss in detail in a separate paragraph). Under “strengths and Limitations”: I would suggest to delete, the third mentioned limitation as this has already been discussed under inclusion criteria. It would be good to discuss whether increased TG levels in the absence of overt GDM or established DM (Type 1 & 2) could be a marker of pre-diabetics in some women who give birth to LGA babies. Are the rationale for, and objectives of, the Systematic Review clearly stated? Yes Are sufficient details of the methods and analysis provided to allow replication by others? Yes Is the statistical analysis and its interpretation appropriate? Yes Are the conclusions drawn adequately supported by the results presented in the review? Yes Competing Interests No competing interests were disclosed. I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard. reply Respond to this report Responses (2) Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna, Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia 1. Thank you for your suggestion. We would like to add this information on discussion section. “Lower TG and Higher HDL-C levels are linked to the physical inactivity, a tendency to less responsive to regular exercise. A program of exercise training is reported effective to alter the concentrations of lipoprotein, which therefore prompt the lipoprotein levels to be in the expected range (1,2). 2. Thank you very much for your corrections. We would like to delete the statement as you suggested. 3. Thank you very much for your suggestion, we have added the informative statement as you suggested in the discussion section. “Maternal lipid profiles are reported as the potential predictor for GDM in pregnant women. High concentrations of TG, TC, and LDL were found in women diagnosed with GDM throughout the second trimester (3). Another prospective cohort had also demonstrated that women who were exhibiting GDM in the second trimester, had shown higher levels of TG, TC, and LDL, and lower levels of HDL during the first trimester, even with normal glycemia and glycated hemoglobin (4). These findings emphasized that the role of lipid metabolism is crucial to contribute to the pathogenesis of such metabolic disorders.” References: (1) (1) C, Després JP, Lamarche B, Bergeron J, Gagnon J, Leon AS, Rao DC, Skinner JS, Wilmore JH, Bouchard C. Effects of endurance exercise training on plasma HDL cholesterol levels depend on levels of triglycerides: evidence from men of the Health, Risk Factors, Exercise Training and Genetics PLEASE NOTE If you are an AUTHOR of this article, please check that you signed in with the account associated with this article otherwise we cannot automatically identify your role as an author and your comment will be labelled as a “User Comment”. If you are a REVIEWER of this article, please check that you have signed in with the account associated with this article and then go to your account to submit your report, please do not post your review here. If you do not have access to your original account, please contact us . User comments must be in English, comprehensible and relevant to the article under discussion. We reserve the right to remove any comments that we consider to be inappropriate, offensive or otherwise in breach of the User Comment Terms and Conditions . Commenters must not use a comment for personal attacks. When criticisms of the article are based on unpublished data, the data should be made available. (HERITAGE) Family Study. Arteriosclerosis, thrombosis, and vascular biology. 2001 Jul;21(7):1226-32. (2) Larrydurstine J, Haskell WL. Effects of exercise training on plasma lipids and lipoproteins. Exercise and sport sciences reviews. 1994 Jan 1;22(1):477-522. References : (3) Correa PJ, Venegas P, Palmeiro Y, Albers D, Rice G, Roa J, Cortez J, Monckeberg M, Schepeler M, Osorio E, Illanes SE. First trimester prediction of gestational diabetes mellitus using plasma biomarkers: a case-control study. Journal of perinatal medicine. 2019 Feb 25;47(2):161-8. (4) Li G, Kong L, Zhang L, Fan L, Su Y, Rose JC, Zhang W. Early pregnancy maternal lipid profiles and the risk of gestational diabetes mellitus stratified for body mass index. Reproductive Sciences. 2015 Jun;22(6):712-7. View more View less Competing Interests No competing interests were disclosed reply Respond Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna, Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia Thank you for your correcting our article.We would like to answer the questions. Results Section 1. We would like to apologize because of several mistakes about the article screening process in Figure 1. We have edited these mistakes and replaced the Figure 1, attached on the revised file "Our search retrieved 649 articles, 147 of which wereindependently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text". . 2. Thank you for your correction. We changed it into: “ We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 3. Thank you for your correction. We changed it into “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included" 4. Thank you for your comment. Actually, this sentence is a mistake and not informative. We decided to delete it because it did not imply our study results 5. Thank you for your comment. We changed it into : "Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants studies” 6. Thank you for your comments. Due to mistyping, we changed it according to your suggestion " HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants" Discussion Section 7. Thank you for your comments. We would like to change the confusing sentences : "A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns". 8. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). 9. Thank you for your suggestion. We added useful information to support our study and put it in disucssion section. "A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (3). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (4). References : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. (3) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (4) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780 View more View less Competing Interests No competing interests were disclosed reply Respond Report a concern Rajadurai VS. Peer Review Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72781) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72781 keyboard_arrow_left Back to all reports Reviewer Report 0 Views copyright © 2020 Liem K. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 03 Nov 2020 | for Version 1 Kian Djien Liem , Department of Neonatology, Radboud University Medical Center, Nijmegen, The Netherlands 0 Views copyright © 2020 Liem K. This is an open access peer review report distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. format_quote Cite this report speaker_notes Responses (2) Approved With Reservations info_outline Alongside their report, reviewers assign a status to the article: Approved The paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. Not approved Fundamental flaws in the paper seriously undermine the findings and conclusions General comments This is a well-written manuscript. The authors have tried to explore the relationships between maternal lipid levels and the risk of having a large for gestational age (LGA) offspring using a systematic review. The results are of great importance for the obstetricians to be aware of the risk factors for developing LGA newborns. With this knowledge of the risk factors, they can take measures in the pregnant woman to prevent LGA newborns. LGA should be avoided as much as possible, since it is a risk factor for developing metabolic syndrome in adult life. The authors have demonstrated that there is an association between maternal lipid levels and risk for LGA newborns, especially high levels TG and low levers HDL-C. But they don’t make any recommendation what we should do for the pregnant women in order to prevent LGA of their offspring’s. Should we determine the lipid level as a routine during pregnancy? But determination of lipid levels during pregnancy could be too late, especially when this is abnormal. Therefore should we give more attention in pre-conception care and recommend normalization of lipid levels, before the women become pregnant? I would like to challenge the authors to make some discussion on the topic about what would be the consequences of their finding. Specific comments Introduction: No comments Methods: No comments Results: Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90 th percentile? But this is different than LGA. Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Page 7, under Total cholesterol. It is mentioned: “Wang reported that abnormal levels of maternal TC were significantly associated with the event of LGA delivery in the first trimester”. What do the authors mean with the event of LGA delivery in the first trimester. Does it mean miscarriage of a foetus, with a body weight > 90th percentile for the gestational age? Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Discussion Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90 th percentile at 26 and 34 weeks age of gestation? Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Are the rationale for, and objectives of, the Systematic Review clearly stated? Yes Are sufficient details of the methods and analysis provided to allow replication by others? Yes Is the statistical analysis and its interpretation appropriate? Yes Are the conclusions drawn adequately supported by the results presented in the review? Partly Competing Interests No competing interests were disclosed. Reviewer Expertise neonatal medicine I confirm that I have read this submission and believe that I have an appropriate level of expertise to confirm that it is of an acceptable scientific standard, however I have significant reservations, as outlined above. reply Respond to this report Responses (2) Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna, Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia Thank you for your correcting this mistake. We would like to answer the questions. As one of the most simple blood measurement, lipid levels especially LGA and HDL-C could be used as a routine blood test during the pregnancy for fetal programming. Normalization of lipid levels should be one of the main targets during the pregnancy. Physical activity and dietary adjustment such as habitual fish consumption would be an effective approach to reduce maternal TG levels and increase HDL-C levels (1,2). Reference : (1) Butler, C. L., Williams, M. A., Sorensen, T. K., Frederick, I. O., & Leisenring, W. M. (2004). Relation between maternal recreational physical activity and plasma lipids in early pregnancy. American journal of epidemiology , 160 (4), 350-359. (2) Williams, M. A., Frederick, I. O., Qiu, C., Meryman, L. J., King, I. B., Walsh, S. W., & Sorensen, T. K. (2006). Maternal erythrocyte omega-3 and omega-6 fatty acids, and plasma lipid concentrations, are associated with habitual dietary fish consumption in early pregnancy. Clinical biochemistry , 39 (11), 1063-1070. View more View less Competing Interests No competing interests were disclosed. reply Respond Report a concern Author Response 29 Jan 2021 Mahendra Tri Arif Sampurna, Department of Pediatrics, Faculty of Medicine, Airlangga University, Surabaya, 60115, Indonesia Thank you for correcting these mistakes in Figure 1 1. Results section, Page 4, the data mentioned under Study characteristics and assessment of risk bias don’t match with the data in figure 1. In the text it is mentioned: “Our search retrieved 649 articles, 147 of which were independently identified as duplications” . But in Figure 1 it is mentioned that the number of articles identified from database search is 643 and 183 is identified as duplicate. Which numbers are the right one? Thereafter, it is mentioned in the text: “Subsequently, we decided to select 77 of 147 articles that had titles and abstracts that were related with the measurement of lipoprotein levels in pregnant women and its impact on neonates”. But this is confusing. Do the authors mean that they select 77 articles from the 147 duplication articles? It doesn’t match with figure 1. A few lines further it is mentioned: “We found that 28 of the 40 articles did not look at the target population, leaving 13 articles that were suitable for inclusion”. But in figure 1 it is mentioned that 12 articles are included. Which number is the right one? In the next paragraph it is mentioned: “There were 12 prospective cohort studies that reported a total of 17,731 cases, 4,430 of which included LGA newborns”. It seems that 12 is the right number, like the number in figure 1. Answers : We would like to apologize because of several mistakes about the article screening process in Figure 1. we would also intend to edit the Figure 1. Regarding the statement, we would revise our statement as follows : Our search retrieved 649 articles, 147 of which were independently identified as duplications and thus leaving 502 articles. Subsequently, we decided to select 77 of 502 articles that had titles and abstracts that were related to the measurement of lipoprotein levels in pregnant women and its impact on neonates. Of the 77 articles, 40 articles that had suitable research methods and outcomes were read in full text. We found that 28 of the 40 articles did not indicate mean ± SD or median with upper and lower quartiles for maternal lipid level measurements. Thus, leaving 12 articles that were suitable for inclusion. 2. Results section, Page 6 and 7: It is mentioned at the end of page 6: “Maternal serum TG levels were found to be significantly associated with LGA foetuses in the first trimester, according to three of the included studies.” . What do the authors mean with LGA foetuses in the first trimester? LGA is defined as birth weight above the 90th percentile for their gestational age and gender. So, it is impossible to speak about LGA fetuses in te first semester. Do they mean the foetuses which in utero grows much larger than average for the gestational age or fetuses with estimated fetal weight > 90th percentile? But this is different than LGA. Answers : Thank you for your correction. We changed the confusing statement to : “ Maternal serum TG levels in the first trimester were found to be significantly associated with LGA infants, according to three of the included studies” 3. Results section, Page 7: It is mentioned: “Each mmol/L increase in maternal serum TG was found to increase the risk for LGA newborns and reduce the probability of small gestational age newborns”. Probably is this sentence not complete. How much is the percentage increase of the risk for LGA newborns and percentage decrease of the probability of SGA newborns for each mmol/L increase in maternal serum TG. Answers : Thank you very much for your corrections. Actually, this sentence is a mistake and not informative statement. We decided to delete it because it did not imply our study results 4. Results section, Page 7 under High density lipoprotein – cholesterol. The authors mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. According to the definition, LGA and SGA can only be diagnosed after birth after weighing the newborn's body weight. What do the authors mean with LGA and SGA fetuses in the third trimester? Do they mean the foetuses which estimated fetal weight larger or less than average for the gestational age? Answers : Thank you for your comment and corrections We would like to change the confusing statement to : Wang reported that abnormal levels of maternal TC in the first trimester were significantly associated with the event of LGA infants 5. Results section, Page 7 under High density lipoprotein – cholesterol. We mention: “HDL-C levels were reported to be significantly associated with the risk for LGA and SGA foetuses in the third trimester of pregnancy”. Answers : Thank you for your corrections. We would like to vhange the statement to : HDL-C levels in the third trimester of pregnancy were significantly associated with both LGA and SGA infants 6. Discussion Section, Page 8: the authors mention: “A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥42 mmol/L (6%) with increased rates of LGA at 26 and 34 weeks age of gestation ”. What do they mean with increased rates of LGA at 26 and 34 weeks age of gestation. Does it mean increased rates of fetuses with estimated fetal weight > 90th percentile at 26 and 34 weeks age of gestation? Answers : Thank you for the corrections. We would like to apologize for confusing statement. We would like to changed it to : A large prospective study on more than 700 women showed significant correlations of T1DM and HbA1c ≥ 42 mmol/L (6%) during 26 and 34 weeks age of gestation with increased risks of LGA newborns. 7. Discussion section, Page 8: the authors discuss the relationship between T1DM, T2DM and GDM with LGA newborns. This is a well-known relationship. Therefore, it is the question whether this has any added value to include in the discussion. Perhaps it might be better when the authors will discuss the influence of abnormal maternal lipid level on the body weight of the foetuses of pregnant women with T1DM, T2DM and GDM. Do pregnant women with T1DM, T2DM and GDM and abnormal maternal lipid level have a higher risk for LGA newborns than in pregnant women with T1DM, T2DM and GDM with normal lipid level? Answers : Thank you ver much for your suggestion. We would like to add useful information to support our study : A previous longitudinal study reported that compared the groups of women with T1DM and T2DM and healthy women found a positive association between maternal serum TG and LGA infants regardless of glycemic levels condition (1). Fasting maternal hypertriglyceridemia could be used as a significant predictor of LGA infants that is independent of maternal BMI, weight gain, and blood glucose levels (2). Reference : (1) Göbl, C. S., Handisurya, A., Klein, K., Bozkurt, L., Luger, A., Bancher-Todesca, D., & Kautzky-Willer, A. (2010). Changes in serum lipid levels during pregnancy in type 1 and type 2 diabetic subjects. Diabetes care , 33 (9), 2071-2073. (2) Kitajima, M., Oka, S., Yasuhi, I., Fukuda, M., Rii, Y., & Ishimaru, T. (2001). Maternal serum triglyceride at 24–32 weeks’ gestation and newborn weight in nondiabetic women with positive diabetic screens. Obstetrics & Gynecology , 97 (5), 776-780. View more View less Competing Interests No competing interests were disclosed. reply Respond Report a concern Liem KD. Peer Review Report For: Maternal lipid levels in pregnant women without complications in developing risk of large for gestational age newborns: a study of meta-analysis [version 2; peer review: 2 approved] . F1000Research 2021, 9 :1213 ( https://doi.org/10.5256/f1000research.28773.r72787) NOTE: it is important to ensure the information in square brackets after the title is included in this citation. The direct URL for this report is: https://f1000research.com/articles/9-1213/v1#referee-response-72787 Alongside their report, reviewers assign a status to the article: Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit. 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Register $(document).ready(function () { signIn.createSignInAsRow($("#sign-in-form-gfb-popup")); $(".target-field").each(function () { var uris = $(this).val().split("/"); if (uris.pop() === "login") { $(this).val(uris.toString().replace(",","/")); } }); });