OBJECTIVE: To assess the association of the gender of the delivering physician and the odds of performing cesarean delivery. DATA SOURCES: CINAHL, ClinicalTrials.gov, Cochrane Library, PubMed, Scopus and Web of Science from the first year of records through May 2020. METHODS OF STUDY SELECTION: We included studies that reported odds ratios (OR), or data allowing the calculation of ORs, for cesarean delivery performed by female and male delivering physicians. We also included studies that reported the preference of physicians for performing cesarean deliveries. TABULATION, INTEGRATION, AND RESULTS: Independent data extraction was carried out by at least two researchers. Standard inverse-variance random effects meta-analysis was used to generate overall ORs. Finally, in two separate meta-analyses, we analyzed 15 studies containing clinical data for 1,269,625 births, and 11 studies containing data for the preference for delivery mode of 4,911 obstetricians. Both the crude and adjusted odds of a cesarean delivery were lower for those performed by female physicians (crude OR 0.75, 95% CI 0.68–0.84, τ2=0.029, adjusted OR 0.74, 95% CI 0.65–0.85, τ2=0.031). We also found that female physicians had a lower preference for cesarean delivery in both crude and adjusted analysis (crude OR 0.59, 95% CI 0.36–0.96, I2=77%, adjusted OR 0.58, 95% CI 0.40–0.84, I2=67%). CONCLUSION: Female physicians are less likely to perform cesarean delivery and less likely to prefer it. This was observed across different health systems and populations. SYSTEMATIC REVIEW REGISTRATION: PROSPERO, CRD42020158442.

Background Unnecessary caesarean births may be affected by physician factors, such as preferences, incentives and convenience. Delivery during office hours can be a valuable proxy for measuring such effects. Objective To determine the effect of office hours on the decision for caesarean delivery by assessing the odds of caesarean during office hours compared to out-of-office hours. Search strategy We searched CINAHL, ClinicalTrials.gov, The Cochrane Library, PubMed, Scopus and Web of Science from the beginning of records through August 2021. Data collection and analysis Search results were screened by three researchers. First, we selected studies that reported odds ratios of caesareans, or data allowing their calculation, for office and out-of-office hours. We extracted data on the study population, study design, data sources, setting, type of caesarean section, statistical analysis, and outcome measures. For groups reporting the same outcome, we performed a standard inverse-variance random-effects meta-analysis, which enabled us to calculate the overall odds ratios for each group. For groups reporting varying outcomes, we performed descriptive analysis. Main results Meta-analysis of weekday vs weekend for any caesarean section showed higher odds of caesarean during weekdays in adjusted analysis 1.40 (95%CI 1.13, 1.72 from 1,952,691 births). A similar effect was observed in the weekday vs Sunday comparison (1.39, 95%CI 1.10, 1.75, 150,932 births). A lower effect was observed for emergency CS, with a slight increase in adjusted analysis (1.06, 95%CI 0.90, 1.26, 2,622,772 births) and a slightly higher increase in unadjusted analysis (1.15, 95%CI 1.03, 1.29, 12,591,485 births). Similar trends were observed in subgroup analyses and descriptive synthesis of studies examining other office hours outcomes. Conclusions Delivery during office hours is associated with higher odds for overall caesarean sections and little to no effect for emergency caesarean. Non-clinical factors associated with office hours may influence the decision to deliver by caesarean section. Further detailed investigation of the “office hours effect” in delivery care is necessary and could lead to improvements in care systems. Funding The authors received no direct funding for this study.