| 9-year-olds | 15-year-olds |  | ||||
---|---|---|---|---|---|---|---|
 | Boys | Girls | Total | Boys | Girls | Total | P-value |
 | (n = 384) | (n = 378) | (n = 762) | (n = 233) | (n = 332) | (n = 565) |  |
MVPA (% time) | 14 ± 7 | 10 ± 5 | 12 ± 6 | 12 ± 5 | 8 ± 4 | 10 ± 5 | P < 0.01*# |
Sedentary (% time) | 41 ± 11 | 43 ± 10 | 42 ± 11 | 55 ± 13 | 60 ± 12 | 58 ± 12 | P < 0.01*# |