Subgroup analyses
We will conduct subgroup analyses (Table GenderWealth index 1 (in three categories determined by the material the house is made of)Wealth index 2 (in five categories determined by the number of relevant items owned by the household, with the interaction tested using a trend test).CastePrimary female caregiver literacy in 3 groups. This to be replaced by female education if more than 10% of the participants have a missing value for literacy and education status is not missing.Primary male caregiver literacy in 3 groups. This to be replaced by male education if more than 10% of the participants have a missing value for literacy and education status is not missing.Village population (above/below median)For each of the above factors, statistical tests for interaction will be carried out, with claims of different effects in subgroups only made if there is strong evidence (