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Table 3 Physical activity mediator scales

From: The Nutrition and Enjoyable Activity for Teen Girls (NEAT girls) randomized controlled trial for adolescent girls from disadvantaged secondary schools: rationale, study protocol, and baseline results

Variables Description and example items Range
(No. of items)
ICC
(95% CI)
α χ2 df p GFI RMSEA
Physical activity mediators         
Self-efficacy Confidence in ability to adopt, maintain and overcome barriers to PA behaviors. For example: "I can still find the time to be physically active even when I've had a busy day". 1-6
(5)
0.91
(0.88 to 0.93)
0.69 3.82 5 0.58 0.99 0.00
Environmental perceptions An individual's mental representation of their environment that may influence their PA behavior:         
     • Home environment - For example: "At home I have access to equipment that helps me to be physically active - e.g. bikes, balls, skateboards". 1-6
(3)
0.88
(0.83 to 0.91)
0.63 11.22 8 0.19 0.98 0.05
     • School environment - For example: "At school, facilities are available during recess/lunch for me to be physically active - e.g. the gym, dance studio, sports equipment". 1-6
(3)
0.85
(0.79 to 0.89)
0.65 11.22 8 0.19 0.98 0.05
Social support Social influences that reinforce PA through encouragement and role modeling:         
     • Peer support - "...how often did you make plans with your friends to be physically active together?' 1-5
(4)
0.91
(0.88 to 0.94)
0.78 27.40 19 0.10 0.97 0.05
     • Family support - For example: "... how often did members of your family participate in physical activities/sports with you?" 1-5
(4)
0.86
(0.81 to 0.90)
0.74 27.40 19 0.10 0.97 0.05
Behavioral strategies Self-reinforcement for PA achieved through setting goals, monitoring behavior and self-reward. For example: "...did you organize to be physically active with a friend or family member?" 1-5
(6)
0.91
(0.88 to 0.93)
0.79 15.45 9 0.16 0.97 0.07
Outcome expectations Anticipated outcomes of PA such as the benefits. For example: "Participation in regular physical activity can help me to improve my fitness". 1-6
(5)
0.82
(0.75 to 0.86)
0.75 11.26 5 0.03 0.97 0.09
Outcome expectancies The value placed on anticipated outcomes of PA. For example: "How important is improving your fitness to you?" 1-4
(5)
0.88
(0.83 to 0.91)
0.66 15.74 5 0.01 0.97 0.11
Intentions Intention to be physically active. 1-4
(1)
0.79
(0.72 to 0.85)
NR NR NR NR NR NR
  1. Note. ICC = Intra class correlation for 2-week test-retest reliability; α = Cronbach alpha; χ2 = Chi-square; df = degrees of freedom; p = probability; GFI = goodness of fit index; RMSEA = root mean square of approximation; NR = Not relevant.