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Background: Postpartum depression (PPD) poses a major global public health challenge. PPD is the most common complication associated with childbirth and exerts harmful effects on children. Although hundreds of PPD studies have been published, we lack accurate global or national PPD prevalence estimates and have no clear account of why PPD appears to vary so dramatically between nations. Accordingly, we conducted a meta-analysis to estimate the global and national prevalence of PPD and a meta-regression to identify economic, health, social, or policy factors associated with national PPD prevalence.

Methods: We conducted a systematic review of all papers reporting PPD prevalence using the Edinburgh Postnatal Depression Scale. PPD prevalence and methods were extracted from each study. Random effects meta-analysis was used to estimate global and national PPD prevalence. To test for country level predictors, we drew on data from UNICEF, WHO, and the World Bank. Random effects meta-regression was used to test national predictors of PPD prevalence.

Findings: 291 studies of 296284 women from 56 countries were identified. The global pooled prevalence of PPD was 17.7%(95% confidence interval: 16.6–18.8%), with significant heterogeneity across nations (Q= 16,823, p= 0.000, I2= 98%), ranging from 3%(2–5%) in Singapore to 38%(35–41%) in Chile. Nations with significantly higher rates of income inequality (R2= 41%), maternal mortality (R2= 19%), infant mortality (R2= 16%), or women of childbearing age working≥ 40 ha week (R2= 31%) have higher rates of PPD. Together, these factors explain 73% of the …