Figure 2.

Forest plot showing body mass index standard deviation score effect sizes (Hedges’ g) of studies evaluating participation in the National School Lunch Program. *Study using the Early Childhood Longitudinal Study – Kindergarten (ECLS-K) cohort.

Williams et al. International Journal of Behavioral Nutrition and Physical Activity 2013 10:101   doi:10.1186/1479-5868-10-101
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