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| Variable category | Indicator | Assignment description |
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| Children behaviour | Weekly frequency of sports activities | Continuous variable, cumulative frequency of multiple physical activities, including bicycling, skateboarding, roller skating, swimming, and playing ball |
| Weekly frequency of media activities | Continuous variable, cumulative frequency of multiple media activities, including watching TV, videos, DVDs, and playing video games |
| Frequency of use of sports equipment | Continuous variable, cumulative frequency of use of multiple sports equipment, including balls, skates, bicycles, swings, slides, and skipping ropes |
| Number of times of playing with friends | More than 5 times per week
3–5 times per week
1–3 times per week
Occasionally
Never |
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| Home environment | SES | Continuous variable, a higher score indicates a better family SES. |
Parental support for children’s sports activities
(i) We do a lot of physical exercises with our children
(ii) Our family values sports
(iii) As parents, we are very interested in our children’s sports activities
(iv) Our children’s sports activities are often a topic of conversation in our family
(v) As parents, we support our children’s sports activities (e.g., chaperoning and transportation). | Entirely supportive
Basically supportive
Uncertain
Basically unsupportive
Entirely unsupportive |
| Frequency of parents’ physical exercise | More than 5 times per week
3–5 times per week
1–2 times per week
No participation |
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