Table 2. Contrast of treatment and control group changes in self-appraisal, mood, and days of voluntary moderate-to-vigorous physical activity over 12 weeks. Data are means (±SD). Treatment (n = 146) Control (n = 123) t267 p d Treatment group (n=146) Self-appraisal measure General self 1.04 (3.22) .08 (1.54) 3.03 .003 .38 Physical appearance 1.34 (2.62) .17 (1.09) 4.63 <.001 .28 Physical self-concept .75 (2.11) .16 (1.07) 2.81 .01 .35 Exerc. barriers self-efficacy 2.19 (3.49) .12 (2.03) 5.80 <.001 .73 Mood Measure Tension -1.88 (3.13) .20 (2.41) 6.02 <.001 .74 Vigor 1.22 (3.74) -.61 (2.59) 4.58 <.001 .57 Voluntary phys. activity days/week 1.05 (2.16) .17 (1.97) 3.46 .001 .43 General self and physical appearance are scales of the Self-Description Questionnaire-I. Physical self-concept is a scale of the Tennessee Self-Concept Scale: 2. Tension and vigor are scales of the Profile of Mood States - Short Form. Exerc. barriers self-efficacy = Exercise Barriers Self-Efficacy Scale for Children. Voluntary physical activity days/week refers to recalled number of days in the previous week where moderate-to-vigorous physical activity was completed outside of PE and after-school care programming. SD = standard deviation; d = Cohen’s measure of effect size.