Postpartum Mental Health Disorders in Indigenous Women: A Systematic Review and Meta-Analysis.

OBJECTIVE: This systematic review synthesized and evaluated the evidence on the prevalence of postpartum mental health disorders in Indigenous women. METHODS: Comprehensive searches of biomedical electronic databases including Medline, EMBASE, PsychINFO, CINAHL, and Web of Science were performed for peer-reviewed literature published from 1990 to September 2018. The search strategy included terms related to the postpartum period, mental health disorders, and Indigenous ancestry. Epidemiological observational studies that evaluated the prevalence of mental health disorders in the postpartum and included Indigenous women from Australia, Canada, New Zealand, and the United States were included. Two independent reviewers screened and evaluated the risk of bias of included studies. A narrative synthesis of study results was conducted. Prevalence estimates from homogeneous studies were pooled in a random-effects meta-analysis (Canadian Task Force Classification II-2). RESULTS: A total of 2297 references were initially identified, of which six studies were included in the review. All included studies evaluated the prevalence of postpartum depression (PPD) and were of moderate or low risk of bias. Other postpartum mental health disorders were not evaluated. Overall, Indigenous women had 87% increased odds of PPD compared with Caucasian groups of women (odds ratio 1.87; 95% confidence interval 1.14-3.09). Substantial heterogeneity across prevalence estimates was observed. CONCLUSION: Limited evidence suggests a greater burden of PPD affecting Indigenous women. There is insufficient evidence informing the prevalence of other postpartum mental health disorders in Indigenous women. More epidemiological research in this area is essential to provide accurate and reliable prevalence estimates of postpartum mental health disorders among Indigenous women.