| 7th grade (190 days) | 8th grade (152 days) | 9th grade (171 days) | All (513 days) | All | Post-hoc | ||
| Mean (SD) | Mean (SD) | Mean (SD) | Mean (SD) | ANOVA p-value | 7-8th grade | 7-9th grade | 8-9th grade |
Light PA (1.5 - 2.9 MET) | 3:28 (0:32) | 2:54 (0:36) | 2:58 (0:42) | 3:08 (0:40) | 0.000 | 0.000 | 0.000 | 0.834 |
Moderate PA (3 - 6 MET) | 0:59 (0:16) | 1:05 (0:23) | 1:03 (0:21) | 1:02 (0:20) | 0.016 | 0.016 | 0.193 | 0.656 |
Vigorous PA (over 6 MET) | 0:08 (0:07) | 0:09 (0:06) | 0:08 (0:06) | 0:08 (0:06) | 0.110 | 0.317 | 0.937 | 0.098 |
MVPA | 1:08 (0:40) | 1:15 (0:43) | 1:11 (0:40) | 1:11 (0:41) | 0.283 | 0.315 | 0.864 | 0.755 |
Time spent standing | 2:36 (0:47) | 2:38 (1:02) | 2:50 (0:57) | 2:41 (0:55) | 0.041 | 0.915 | 0.030 | 0.287 |
Time spent sitting | 6:30 (1:05) | 6:31 (1:07) | 6:25 (1:04) | 6:29 (1:05) | 0.667 | 10.000 | 0.782 | 0.864 |
Time spent lying | 1:19 (1:13) | 0:41 (0:35) | 1:20 (1:08) | 1:08 (1:05) | 0.000 | 0.000 | 10.000 | 0.000 |
Total sedentary (sitting and lying) | 7:51 (2:01) | 7:11 (1:18) | 7:45 (2:02) | 7:37 (1:52) | 0.003 | 0.001 | 0.970 | 0.008 |