Table 4.
Multivariable mixed effects model examining estimated effect on students’ baseline MVPA and MVPA trajectories adjusting for study condition, student characteristics, and school neighbourhood characteristics
| Accelerometer data | Fixed effect (95% CI) | P value |
|---|---|---|
| Estimated effect on baseline MVPA (minutes/day) | ||
| Study condition | ||
| Comparison (Alberta) | Referent | 0.0799 |
| Intervention (Manitoba) | 8.23 (−0.98, 17.43) | |
| Baseline age | 0.58 (−1.83, 2.99) | 0.6366 |
| Sex | ||
| Male | Referent | <.0001 |
| Female | −11.09 (−14.16, −8.02) | |
| BMI status | ||
| Healthy weight | Referent | |
| Overweight or obese | 0.02 (−4.07, 4.12) | 0.9898 |
| Missing | −0.57 (−5.33, 4.20) | 0.8150 |
| School rural/urban | ||
| Urban | Referent | 0.5982 |
| Rural | −1.85 (−8.72, 5.03) | |
| School socioeconomic status | ||
| High | Referent | 0.0048 |
| Low | −10.24 (−17.35, −3.14) | |
| Estimated effect on MVPA trajectories (minutes/day per semester) | ||
| Study condition | ||
| Comparison | Referent | 0.1243 |
| Intervention | −1.52 (−3.47, 0.42) | |
| Baseline age | −0.62 (−1.38, 0.15) | 0.1143 |
| Sex | ||
| Male | Referent | 0.2846 |
| Female | 0.55 (−0.46, 1.57) | |
| BMI status | ||
| Healthy weight | Referent | |
| Overweight or obese | −0.40 (−1.83, 1.04) | 0.5858 |
| Missing | −0.18 (−1.42, 1.07) | 0.7792 |
| School rural/urban | ||
| Urban | Referent | 0.4673 |
| Rural | 0.47 (−0.80, 1.74) | |
| School socioeconomic status | ||
| High | Referent | 0.0013 |
| Low | 2.13 (0.83, 3.43) | |
Note: Fixed effects of intercepts for each model are not shown. 95% confidence intervals are shown in parentheses. Referent categories are identified as “Referent”