Review of published systematic reviews and meta-analyses on COVID-19

Purpose The rapid spread of the COVID-19 pandemic has prompted researchers from all over the world to share their experience. The results were numerous reports with variable quality. The latter has provided an impetus to examine all published meta-analyses and systematic reviews on COVID-19 to date to examine available evidence. Methods: Using predefined selection criteria, a literature search identified 43 eligible meta-analyses and/or systematic reviews. Results: Most (N=17) studies addressed clinical manifestations and associated comorbidity, 6 studies addressed clinical manifestations in pregnant women and younger individuals, 8 studies addressed diagnostic data, 9 studies addressed various interventions, and 9 studies addressed prevention and control. The number of studies included in the various systemic reviews and meta-analyses ranged from 2 to 89. While there were some similarities and consistency for some findings, e.g. the relation between comorbidities and disease severity, we also noted occasionally conflicting data. Conclusion: As more data are collected from patients infected with COVID-19 all over the world, more studies will undoubtedly be published and attention to scientific accuracy in the performance of trials must be exercised to inform clinical decision-making and treatment guidelines.