Figure 2

Changes in BMI-for-age Z score for students overweight at baseline. BMI-for-age Z score, measured during the fall (pre) and the spring (post) of 2012 and 2013, respectively, for students overweight at baseline (fall measurement), from a cohort of 22 schools starting the HealthMPowers program in 2011–2012 and providing data on student knowledge and behavior, fitness measurements (BMI, PACER test), HealthMPowers resource usage, and school policies and practices. Paired two-sample t test used to evaluate changes in pre vs. post BMI-for-age Z score. Alpha=0.0005.