Randomization and Blinding
An independent statistician (not otherwise involved in the trial) prepared the randomization schedule. Parents were randomly assigned to study arm in a 1:1 ratio using ralloc.ado, version 3.7.6 in Stata, version 16 (StataCorp). Allocations were performed using randomly permuted blocks of size 4, stratified by child age group (<5 years, 5-14 years, >14 to <18 years). The schedule was provided electronically to the support staff of WCHN’s information communication technology applications system. The support staff then allocated participants according to the schedule. The trial statistician (A.R.C.) remained blinded until the database was locked for analysis. Given the nature of the intervention, the study coordinator (K.H.) was not blinded to allocation. Intervention components were provided, as per study trial arm.