Table 3.

Planned subgroup analysis

Key questions	Both populations	General adult	Pregnancy and postpartum
1 and 1a	▪ Socioeconomic status (e.g. income, level of education, as assessed by study authors) ▪ Race/ethnicity (will be determined post hoc, depending on populations encountered in studies) ▪ Geographical location (e.g. rural vs urban settings, country/region) ▪ Validated vs non-validated tools	▪ Gender/sex	▪ Timing period and frequency of screening (e.g. prenatal, immediate postpartum)
1 only	▪ Age groups (e.g. < 25 years of age) ▪ Immigrant status		▪ Support status (e.g. single mother with no family support vs other) ▪ Partum status (e.g. first child vs later)
1a only	▪ Risk factors for depression (to be determined post hoc, depending on the combination of risk factors as reported in studies).