Table 1.  Changes in self-appraisal, mood, and days of voluntary moderate-to-vigorous physical activity over 12 weeks. Data are means (±SD).
   

Baseline

Week 12

t

p

d

Treatment group (n=146)

            
 

Self-appraisal measure

          
 

General self

28.4 (5.3)

29.5 (4.8)

3.00

.003

.19
 

Physical appearance

31.2 (5.8)

32.5 (5.8)

3.73

<.001

.23
 

Physical self-concept

35.0 (5.5)

35.7 (5.5)

1.99

.05

.14
 

Exerc. barriers self-efficacy

26.5 (9.4)

28.7 (9.8)

4.53

<.001

.23
 

Mood Measure

          
 

Tension

11.9 (4.5)

10.1 (4.5)

-6.87

<.001

.42
 

Vigor

15.9 (4.6)

17.1 (4.3)

3.94

<.001

.26
 

Voluntary phys. activity days/week

2.3 (1.8)

3.3 (1.8)

7.09

<.001

.58

Control group (n=123)

            
 

Self-appraisal measure

          
 

General self

29.5 (5.7)

29.6 (6.4)

.84

.40

.01
 

Physical appearance

31.0 (6.0)

31.1 (6.1)

.63

.63

.03
 

Physical self-concept

33.0 (4.6)

33.2 (5.9)

.41

.68

.04
 

Exerc. barriers self-efficacy

27.3 (8.5)

27.4 (8.2)

.29

.77

.01
 

Mood Measure

          
 

Tension

11.4 (4.6)

11.6 (4.9)

.59

.56

-.04
 

Vigor

16.3 (5.4)

15.7 (5.6)

-1.10

.27

-.11
 

Voluntary phys. activity days/week

2.3 (1.6)

2.5 (2.2)

.97

.33

.09
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. Treatment group df=144; Control group df= 121.