From: Prevalence of exercise and non-exercise physical activity in Chinese adolescents
 | Boys (n = 14,274) | Girls (n = 17,731) |  |
---|---|---|---|
 | % | % | *P |
School days | Â | Â | Â |
Age group | Â | Â | Â |
   12 or below | 74.4 | 73.6 | 0.51 |
   13 | 74.7 | 71.0 | 0.003 |
   14 | 75.7 | 71.4 | <0.001 |
   15 | 76.6 | 71.6 | <0.001 |
   16 | 76.0 | 69.1 | <0.001 |
   17 | 76.4 | 65.9 | <0.001 |
   18 or above | 70.9 | 64.2 | <0.001 |
   All | 75.1 | 70.3 | <0.001 |
P for trend | 0.68 | <0.001 | Â |
Holidays | Â | Â | Â |
Age group | Â | Â | Â |
   12 or below | 81.5 | 81.7 | 0.87 |
   13 | 80.4 | 81.9 | 0.18 |
   14 | 81.1 | 80.2 | 0.40 |
   15 | 82.8 | 81.9 | 0.43 |
   16 | 82.5 | 78.5 | 0.001 |
   17 | 83.4 | 78.8 | 0.002 |
   18 or above | 82.1 | 78.4 | 0.015 |
   All | 81.8 | 80.5 | 0.003 |
P for trend | 0.04 | <0.001 | Â |