Data analysis
To assess the impact of the sanitation intervention on latrine, child potty and sani-scoop/similar tool access and use, we compared the prevalence of each individual and composite spot-check indicator and reported practice between the sanitation and control arms, using pooled data from all eight data collection rounds. We used population-averaged generalized linear models (GLM) (We investigated effect modification on intervention impacts on hygienic latrine access, potty use and sani-scoop/similar tool use by the following factors: time since study onset, ongoing intervention promotion, age of index child and index child's primary caregiver, education of caregiver, education of father, household wealth, number of individuals in the compound, and number of children <5 years in the compound. For the time since study onset, we used a binary indicator variable for the first half (data collection rounds 1–4) vs. second half (rounds 5–8) of the follow-up period. We also compared periods of ongoing intervention promotion (rounds 1–6) vs. no promotion (rounds 7–8). We calculated a household wealth index using principal components analysis based on measured assets and housing materials (