Table 2 Physical activity cpm during school hours (square root transformed) is shown as a function of time, group status, BMI and sex. Repeated measures mixed effects models were built to contrast the two study groups, intervention vs. control, over time with regard to physical activity during school time, controlling for the clustering of data structure.
From: Assessment of a two-year school-based physical activity intervention among 7-9-year-old children
| Â | Basic models* | |||||
|---|---|---|---|---|---|---|
| Â | counts per minute(cpmschool) | MVPAschool (mins/day) | ||||
|  | β | CI | p-value | β | CI | p-value |
Constant | 25.25 | (22.96, 27.54) | >.0001 | 5.47 | (4.57, 6.37) | >.0001 |
Groupa | 1.13 | (-3.43, 5.70) | .53 | 0.62 | (-1.18, 2.42) | .39 |
Time(mid)b | -0.31 | (-1.26, 0.64) | .52 | -0.06 | (-0.40, 0.27) | .72 |
Time(post)b | -0.60 | (-1.56, 0.36) | .22 | 0.32 | (-0.03, 0.67) | .07 |
Time(mid) x Group | 3.60 | (2.31, 4.89) | >.0001 | 0.98 | (0.53, 1.43) | >.0001 |
Time(post) x Group | 0.24 | (-1.04, 1.53) | .71 | -0.39 | (-0.85, 0.07) | 0.1 |