In a generalized estimating equations analysis, the intervention group had an increasingly lower mean BMI compared with the control group. The difference in BMI between the intervention and control groups peaked at 3 years for girls with normal weight (beta = 0.937; 95% CI, 0.845-1.029) and girls with obesity (beta = 1.417; 95% CI, 0.959-1.875) and at 4 years for girls with overweight (beta = 1.151; 95% CI, 0.785-1.517). Among boys, the difference in BMI change between intervention and control participants plateaued at 3 years for those with normal weight (beta = 0.851; 95% CI, 0.766-0.935), overweight (beta = 0.766; 95% CI, 0.542-0.989) and obesity (beta = 0.889; 95% CI, 0.461-1.316).