Objectives: Metaanalyses have found that sociodemographic variables are not strong predictors of postpartum depression. However, no studies have systematically examined the extent to which the samples used in published research on postpartum depression have included sufficiently diverse samples of women to merit this conclusion. The objectives of this study were to examine the demographic characteristics of participants in previously published studies and to document existing gaps in the current literature.
Method:We extracted age, ethnicity, relationship status, and socioeconomic status of 51 453 participants from 143 studies previously selected for systematic literature reviews.Results: Few studies reported complete demographic data; however, existing data indicate that participants were predominantly aged 25 to 35 years, white, partnered, and of mid-or high-socioeconomic status.
Conclusions:To assess the external validity of the findings, improved reporting of demographic characteristics is required in publications related to postpartum depression. Additional research is needed to understand postpartum depression among understudied populations. However, most studies have been conducted in Western societies with younger, white, partnered women of higher socioeconomic status. · It is not clear that previously published risk factors or treatment and prevention guidelines are suitable for, or relevant to, diverse populations.
Limitations· We included only English-language studies in this review, and it is possible that studies published in other languages reflect more diversity in the countries of origin of the studies and, therefore, in the ethnicity of participants. · Sufficient data were available to examine only 4 demographic variables. · Many studies did not report complete data for the demographic variables examined.