Methods
We used data from the Furthering Understanding of Cancer Health and Survivorship in Adult (FUCHSIA) Women’s Study. The FUCHSIA Women’s Study is a population-based cohort study examining how cancer treatment during the reproductive years affects future fertility. It compares the reproductive experiences of female cancer survivors to a group of comparison women who never had cancer treatment. Comparison women were frequency matched on 5 year age ranges and Georgia region of residence to the cancer survivors. Analyses for this paper utilize comparison women only because women who have been treated for cancer may have different motivations and access to medical care for help becoming pregnant compared with the general population, even if they did not receive treatment believed to impair fertility. Women were eligible to participate if they were 22-45 years old at recruitment, had a working telephone, and spoke English. Women were recruited to participate in the study independent of their fertility status, which allows us to examine infertility service use in the overall population and characterize participants who did and did not seek help for becoming pregnant. Women consented to participate and completed the study interview by telephone. The study was approved by the Emory University and Georgia Department of Public Health Institutional Review Boards.
Defining race and racial disparities in health are challenging. 24 In this study, the exposure was designated as self-reported black race compared with self-reported white race. We used self-reported race to represent the composite of factors that make up the experience of being black in the US to estimate disparities attributable to this complex measure. The outcome was whether or not women accessed care for help getting pregnant regardless of whether they used treatment or not. It was determined by the question “Have you ever visited a doctor or health professional for help becoming pregnant?” We also collected information on periods of possible impaired fertility through the question “Has there ever been a period of time during which you had unprotected sex with a male partner for 6 months or longer but you did not get pregnant? Only count periods of time when you had sex at least 3 times per month.” Participants who answered ‘yes’ to this question were classified as sub-fertile. Follow-up questions captured the total number of months of impaired fertility, age when it happened, whether the woman was actively trying to get pregnant at the time, if spontaneous conception occurred, and any recurrences. We used the age and total months of impaired fertility to define infertility. Women reporting a period of time lasting 12 months or longer between the ages of 20-34 years or a period of 6 months or longer at age 35 years or older when they had unprotected intercourse but did not get pregnant were classified as infertile. These determinations correspond to the American Society for Reproductive Medicine definition of infertility, although their definition also includes that unprotected intercourse must be appropriately timed. 25
Interviewers collected information from women on their general health and reproductive experiences, as well as demographic and lifestyle characteristics. We asked women for their race, current level of education, total household income in the previous 12 months, and address at the time of the interview. We asked participants how many children they had given birth to and how many children they desired. To gauge women’s feelings about invasive infertility procedures, women were asked about their comfort with intrauterine insemination and IVF using a 5 point Likert type scale. Women also answered questions about diagnosis with reproductive conditions including polycystic ovary syndrome, fibroids, or endometriosis and sexually transmitted infections (STIs) including chlamydia, gonorrhea, or pelvic inflammatory disease.
Many of the participant characteristics collected in the interview were considered mediators of the association between race and visiting a doctor for help getting pregnant in our conceptual framework. Our main objective was to quantify the racial disparity that remains if the distribution of these sociodemographic factors were balanced between black and white women. To do this, we controlled for measured variables on all indirect paths between the social construct of race and visiting a doctor for help getting pregnant in a weighted analysis. Weights were created using the inverse probability of the participants’ self-reported race based in their education, income, place of residence, comfort with assisted reproductive technology (ART) and history of reproductive conditions, and STIs. The weights created a pseudo-population where hypothesized mediators were balanced between black and white women. For analyses conducted in the subgroup of women who reported infertility, age at infertility and whether or not a woman was actively trying to get pregnant were also included as mediators in the estimation of the weights. Weights were scaled to represent the observed sample size. Values in the tails of the distribution (at the 5 st and 95 th percentile) were truncated to reduce the influence of extremely large or small weights in the analysis. 26
We fit generalized linear models with a log binomial distribution to estimate the total and direct effect of the social construct of race on visiting a doctor for help getting pregnant. To compare the results from our weighted analysis to traditional multivariable methods we fit a modified Poisson model with robust variances, because the log binomial model did not converge. 27 Assuming that our conceptual framework depicts the true causal relationships, differences in the coefficients from the models with versus without adjustment for mediating variables represents the proportion of the total effect mediated by the specified paths. 28
To address possible differences by race in the time waited before visiting a doctor for help getting pregnant, we fit Cox proportional hazard models to estimate hazard ratios for visiting a doctor among women with infertility. The start time in these models was defined as the age at which women reported their first infertile period and the event time was the age at first doctor’s visit. Women who did not visit a doctor were censored at age of hysterectomy, menopause, spontaneous conception, or interview. Survival models were adjusted for the same set of mediators as models in the main analysis using multivariable and weighted models. SAS 9.3 was used for all statistical analyses.
Results
The FUCHSIA Women’s Study comparison group included 1,073 women. Of these women, 309 were black (29%), 712 were white (66%) and 52 reported another race (5%). Our analyses were restricted to women who reported black or white race. Characteristics of the sample by race are presented in Table 1 . Median age at interview was 38 years for both black and white women. Black women in the study population had comparable education levels to white women, but lower household incomes. Most study participants resided in a large metropolitan area, with more white women reporting rural residence. The prevalence of STIs was higher among black women compared with white women (25% vs 5%) as well as the prevalence of fibroids (30% vs. 9%), while other reproductive conditions were more similarly distributed. Childlessness differed between the groups with 73% of black women and 84% of white women giving birth to at least one child at the time of the interview. Meeting reproductive goals also differed by race with over half of black women reporting they currently had fewer children than they desired compared with 39% of white women. The characteristics among the subgroup of women who experienced infertility were similar to the full sample (data not shown).
Of the 978 women who answered the question about experiencing impaired fertility, 44% reported a sub-fertile period, with similar reporting by race ( Table 2 ). When using the stricter definition of infertility, the percentage dropped to 30% for black women and 28% for white women. Among the infertile, 67% of black women and 76% of white women reported primary infertility, or infertility before ever giving birth. Although report of this more restrictive period of infertility was similar by race, there were large differences in who was actively trying to get pregnant among this group. Thirty-two percent of black women and 67% of white women reported they were trying to conceive at the time of infertility.
Estimates of the total effect of the social construct of race on visiting a doctor for help getting pregnant showed that black women were less likely to have a visit [risk ratio (RR) = 0.42, 95% confidence interval (CI): 0.28, 0.64] ( Table 3 ). This association remained in the subset of women who experienced infertility [RR = 0.48, 95% CI: 0.32, 0.71]. Estimates of the direct effect in the full sample using the weighted model was RR = 0.57, 95% CI: 0.41, 0.80. Among the subgroup of women who reported infertility, the weighted RR was 0.75, 95% CI: 0.56, 0.99. In multivariable models including the full set of mediators, the results were similar. The difference in the coefficients from the unadjusted and adjusted models represents 35% of the total effect explained by mediating paths in the full sample and 61% in the subgroup of women with infertility.
The distribution of ages at reported infertility cluster in the 20’s for both black and white women with an overall median age of 26 years [interquartile range (IQR): 23-30]. Age at visiting a doctor for help getting pregnant among women with infertility is shifted towards the 30’s with an overall median age of 29 years [IQR: 26-32]. Among women who visited a doctor after they reported infertility, white women waited a median of 1 year [IQR: 0-2] and black women waited 2 years [IQR: 0-4]. The unadjusted Kaplan-Meier plots show black women are less likely to have visited a doctor by the study interview ( Figure 1 ). The maximum time women waited from first infertile period to visit was 12 years for both black and white women, however at this time 47% of white women and only 22% of black women had visited a doctor for help. The unadjusted hazard ratio (HR) for the association between race and visiting a doctor for help getting pregnant was 0.37, 95% CI: 0.22, 0.60 ( Table 4 ). Adjusted models controlled for the same mediators as the main models restricted to infertile women. Using traditional adjustment, the estimated association moves towards the null [HR = 0.68, 95% CI: 0.39, 1.16], but the reduced likelihood of visiting a doctor remained. In the weighted model, the estimate was of a consistent magnitude as the fully adjusted model [HR = 0.70, 95% CI: 0.48, 1.03].
Conclusions
There were substantial racial differences in visiting a doctor for help getting pregnant in this study even though reports of impaired fertility were similar across race groups. To examine racial disparities in this paper, we used black race as the exposure in our analyses, recognizing that race is an amalgam of many different components. We were focused on aspects of the experience of black race in the context of the US as a result of cultural beliefs, experiences with discrimination, poor access to healthcare and economic opportunity among other factors. Our goal was to estimate the racial disparity that remained after accounting for a set of identified mediating paths from the social construct of race to visiting a doctor for help getting pregnant. We controlled for hypothesized mediators of this association, including sociocultural factors such as comfort with using assisted reproductive technologies, which other studies report differ by race. 21 , 29
In the main analysis, we included all women regardless of their infertility status to get a picture of the overall disparity in infertility service use. In our study, 9% of women who reported visiting a doctor for help getting pregnant never reported experiencing infertility. We addressed those most likely to need medical help for getting pregnant in the analyses restricted to infertile women. In mediator-adjusted models, hypothesized intermediate pathways were only able to partially explain the difference by race in visiting a doctor for help getting pregnant. Adjusted estimates from the survival analysis were consistent and showed that not only do black women visit the doctor for help getting pregnant less often than white women, they also wait longer after experiencing infertility. The fact that racial disparities persist despite control for mediating paths suggests that additional components that contribute to the social construct of race are influencing this association.
Sociocultural factors that were unmeasured in our study may explain some of the racial disparity we found. In our study we controlled for discomfort with ART, which only partially captures the stigmatization that may surround infertility for some women. In a fertility clinic-based study, compared with white women, black women were more likely to report that they were concerned about social stigmatization and disappointing a spouse because of their infertility. 29 Furthermore, black women were more likely to report concern about friends and family finding out about treatment and to self-refer for care, suggesting a lack of support for care seeking for infertility in their social network. While black women were more likely to self-refer for fertility care compared with white women in this clinic-based study, we did not see this difference in our study. The remaining racial disparity we observed could also be the result of unmeasured confounding. We did not hypothesize any factors in our conceptual framework that would cause race and visiting a doctor for help getting pregnant. All of the covariates considered were mediators of this association. It is possible that there were factors that were not identified that confound the association between some of the mediators considered and the outcome, which could be distorting the estimate of disparities we found.
There are some data to support demographic differences in pregnancy planning. In a study of low income women recruited from a reproductive health clinic, they found that many women had unclear pregnancy intentions and so were not actively trying to get pregnant or using contraception. 30 Another study found that black women were more likely to report an infertile period without the intent of getting pregnant. 4 In our study, black women were less likely to be married or report they were trying to get pregnant during an infertile period compared with white women. However, women who are not married or cohabitating may still want to have a child and women not actively trying may want children in the future. The broad definition of infertility we used enabled us to capture potential fertility problems in all women. While every woman classified as having infertility in our study does not represent unmet need (e.g., women who do not desire children or have completed their family size) and some may be the result of mistimed intercourse, it is important to identify all women who are at possible risk of needing medical care for infertility. Regardless of women’s desire for children, infertility could represent an underlying reproductive condition or sexually transmitted infection that could be alleviated or treated with medical care.
Since fertility as well as the potential success of infertility treatments decline with age, there is also a benefit to discussing infertility treatment options with younger women. 31 , 32 For example, with IVF, the success rate of fresh non-donor cycles has been reported to be 40% in women 35 years and younger and only 1% in women 44 years and older. 31 Despite our broad inclusion criteria, models restricting to women who reported primary infertility and wanting to have at least one child still showed a racial disparity.
The FUCHSIA Women’s Study was well suited to examine disparities by race. Women who participated in our study reflect the demographic composition of Georgia women of reproductive age (20-44 years), which is 34% black. 33 Therefore, black women, a traditionally underrepresented group, had good representation in this study. Categories of education, place of residence, and household income were also well represented. In addition, women were recruited to participate in the study independently of their fertility status. This is in contrast to clinic-based studies that can only describe disparities among women who visit a fertility clinic for help getting pregnant, giving our study the advantage of being able to compare women who did and did not visit a doctor for help getting pregnant.
We recruited women using a purchased marketing list which may have lacked information on some women we wanted to participate in our study. This may have been a source of selection bias, but comparison women were similar to cancer survivors on many factors including race. Another potential limitation is that the data are restricted to self-reported information on fertility discussions with healthcare providers without verification of these visits with medical records. However, we expect women are able to remember a self-initiated visit to the doctor for help getting pregnant and found in our pilot studies that women are able to consistently report information about their fertility and infertility treatments received. 34
Our study showed that even with control for an extensive list of hypothesized mediators a black/white racial disparity persisted. It is possible that stigma around infertility, which was unmeasured in our study, may be contributing to this disparity by limiting the sources of informal information and advice black women have access to in their social network. Better targeting of online resources, which have been suggested to be a preferred method of receiving information on stigmatized illnesses, could improve access to information on infertility and treatment. 35 Accessing information online is associated with women feeling more comfortable discussing infertility issues with their healthcare provider. 36 Initiation of conversations about available counseling and treatment options by a primary healthcare provider could also improve the exchange of information. This may decrease feelings of discomfort in visiting a specialist or using ART. Further, additional targeted outreach by organizations already in existence to fight stigma and improve knowledge about fertility problems, as well as support those suffering from infertility could be beneficial. 7 Provision of information on the wide range of counseling and treatment options from different sources may decrease discomfort with infertility services, in turn reducing the disparity in their use, and help a greater number of women meet their reproductive goals.
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