Table 1: Scores of Youth Fit 4 Life participants over 9 months, by body composition classification.

Baseline
Mean±SD 		Month 3
Mean±SD 		Change: Baseline-Month 3
Mean±SD t (d) 		Month 9
Mean±SD 		Change: Baseline-Month 9
Mean±SD t (d)
Overweight/obese group (n=32)
Self-efficacy 17.44±4.83 18.69±4.46 1.25±4.75 1.49 (0.26) 19.25±4.27 1.81±4.74 2.16* (0.37)
Self-regulation 17.25±1.98 18.34±2.29 1.09±1.94 3.19** (0.55) 18.13±2.32 0.88±2.08 2.08* (0.44)
Negative Mood 6.38±3.49 4.56±3.78 -1.81±3.72 2.76** (0.52) 4.03±4.55 -2.34±4.34 3.06** (0.67)
BMI (kg/m2) 23.02±2.60 23.03±2.62 -0.15±0.71 1.17 (0.06) 23.13±2.60 -0.36±0.78 2.57* (0.14)
Normal Weight group (n=54)
Self-efficacy 16.04±5.41 17.09±4.81 1.06±5.28 1.47 (0.20) 17.48±4.75 1.44±4.82 2.20* (0.27)
Self-regulation 16.89±2.74 17.52±2.63 0.63±1.72 2.69** (0.23) 17.76±2.76 0.87±2.49 2.57* (0.32)
Negative Mood 6.98±3.58 6.02±3.66 -0.96±3.52 2.01* (0.27) 4.30±4.02 -2.69±3.85 5.13***(0.75)
BMI (kg/m) 16.55±1.50 16.59±1.65 -0.12±0.64 1.39 (0.08) 16.69±1.77 -0.33±0.91 2.65** (0.22)

Note: Possible score ranges: self-efficacy (5–25), self-regulation (5–20), negative mood (-4–20). For overweight/obese df=31. For normal weight df=53. Effect sizes for within-group changes (dependent t-tests) are expressed as Cohen’s d (meanbaseline-meantime2/SDbaseline), and considered small (0.20) to large (0.80). Within-group changes in BMI, t-values and d-values reflect changes adjusted for participants’ maturation (accounting for age, sex, and baseline BMI). *P≤0.05. **P≤0.01. ***P≤0.001.