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Table 3 Factor structure and test-retest reliability of the emergent scales in the questionnaire

From: Reliability and validity of psychosocial and environmental correlates measures of physical activity and screen-based behaviors among Chinese children in Hong Kong

Scales % Variance explained Eigen value Cronbach's alpha Test-retest ICC
Self-efficacy 47.0 2.35 0.75 0.82
Variable removed: Walk to school instead of having to wait for a ride
Family and peer support for PA
Factor 1: Family support Being physically active with whole family; with father; with mother; with sibling 28.2 2.26 0.74 0.86
Factor 2: Peer support Being physically active with friends; receive encouragement from friends 15.3 1.22 0.50 0.78
Variable removed: Being physical active with grandparents; receive encouragement from family member
Rules and guidance on children's screen-based behaviors
Factor1: Guidance Guidance during TV, computer games and Internet use 44.0 2.64 0.86 0.83
Factor 2: Rules Control time in TV, computer & Internet use; no TV during meal time; not allow TV until homework done 20.6 1.23 0.65 0.81
Perceived neighborhood safety 45.5 2.25 0.71 0.89
Social environment in the neighborhood 55.8 2.23 0.73 0.84
  1. PA: physical activity; TV: television
  2. Principal axis factoring with direct oblimin rotation (if two factors are identified). Kaiser-Meyer-Olkin values range from 0.650 (social environment in the neighborhood) to 0.728 (rules and guidance). Bartlett's Test of Sphericity for all the scales are significant at P < 0.01.
  3. Variables that have factor loadings < 0.30 are removed.