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Table 2 Item characteristics and internal consistencies of modified scales in their final version

From: “läuft.” - a school-based multi-component program to establish a physically active lifestyle in adolescence: study protocol for a cluster-randomized controlled trial

  

Pilot study (N = 89)

Scales

Number of Items

Cronbach’s α

Item-rest correlation

Item difficulty (in%)

General self-efficacy

5

.83

.58 to .66

60.8 to 68.2

Self-concept: general physical capacity

5

.92

.78 to .83

50.6 to 70.5

Self-concept: physical attractiveness

5

.84

.58 to .71

57.9 to 76.1

Sensation seeking

2

.86

 

41.0, 43.6

Self-efficacy for physical activity

8

.87

.56 to .78

42.9 to 70.5

Physical activity enjoyment

10

.92

.58 to .85

53.9 to 75.6

Sedentary behavior enjoyment (screen-based)*

4

   

Sedentary behavior enjoyment (non-screen-based)

4

.89

.57 to .84

54.2 to 66.4

Parental support for physical activity

2

.79

 

31.3, 34.8

Psychological well-being

5

.80

.46 to .72

55.3 to 74.4

Physical well-being

2

.70

 

59.8, 66.1

  1. *In the pilot questionnaire there were two separated scales for TV/DVD time and computer use. Both scales will be combined as overall screen-based sedentary behavior. Hence, there are no item characteristics available for this combined scale.