Table 1.

Data collection overview

Data collection phase	Instruments
Baseline (12,000)	Participant identification, anthropometrics, and habits Socioeconomic characteristics Household characterisits Previous gestational information Maternal depression (EPDS) Neighborhood characteristics and social support Couples’ conflict Parental knowledge Maternal cognitive development (WAIS) Paternal characteristics
Main endline (N = 3000)	Child development (PRIDI) – Primary outcome Maternal depression (CES-D) Caregiver self efficacy (PSOC) Parental style (ACT) Parental knowledge Child anthropometrics (height and weight)
In-depth endline assessment (N = 240)	Attachment and caregiver interactions (OMCI) Bayley Scales for Infant and Toddler Development (BSID-III)
Qualitative interviews	Focus groups with child development agents and group-meeting facilitators Individual interviews with program beneficiaries divided by full compliers, non-compliers, and dropouts by intervention study arm

ACT, BSID-III Bayley’s Scales for Infant and Toddler Development, CES-D Center for Epidemiologic Studies Depression Scale, EPDS Edinburgh Postnatal Depression Scale, OMCI Observation of Mother-child interaction, PRIDI Regional Project on Child Development Indicators, PSOC Parenting Sense of Competence Scale, WAIS Weschsler Adult Intelligence Scale