Methods for additional analyses (e.g., subgroup analyses) {20b}
Potential differences in treatment effects across influential participant characteristics (e.g., maternal age, number of children, infant sex) and group WCC characteristics (e.g., group size) will be assessed. A scale variable that will reflect a participant’s attendance level at group WCC visits will be created and included in the models to evaluate whether there is a “dose–response” intervention effect. Analyses will follow intent-to-treat principles, with participants analyzed according to randomized treatment assignment. In addition, a “per-protocol” analysis will be performed; the per-protocol analysis would include only participants who were adherent to their assigned study regimen and completed 75% of the recommended number of WCC sessions by 18 months of follow-up.