Sample size
weight gain
The sample size for the study was calculated considering weight gain as the primary outcome variable, 80% power, 5% level of significance, an attrition rate of 10%, weight gain in the control group of 10%, and weight gain in the intervention group as 25%. The required sample size was 234; 117 each in the intervention and control groups. Adopting the cluster sampling method, we recruited 253 children: 127 in the intervention arm and 126 in the control arm.