Table 2. Multilevel analysis of moderate to vigorous physical activity during different school day segments with average and days methods.
| Average method | Days method | ||||||
|---|---|---|---|---|---|---|---|
| Outcome measure | Variable | Estimate | SE | 95% CI | Estimate | SE | 95% CI |
| Day MVPA | Intercept | 10.56 | 7.50 | -4.13, 25.25 | 25.68 | 8.23 | 9.55, 41.82 |
| Gendera | -5.33 | 1.43 | -8.14, -2.52 | -5.00 | 1.67 | -8.27, -1.73 | |
| School levelb | -3.12 | 1.52 | -6.10, -0.14 | -4.39 | 1.77 | -7.85, -0.93 | |
| BMI | -0.14 | 0.21 | -0.56, 0.28 | -0.38 | 0.25 | -0.87, 0.10 | |
| Time in segment | 0.06 | 0.01 | 0.05, 0.08 | 0.06 | 0.01 | 0.05, 0.08 | |
| PA groupc | 35.69 | 1.51 | 32.73, 38.66 | 33.59 | 1.98 | 29.71, 37.47 | |
| Total variance (%) | 11.88 | 23.34 | |||||
| Before-school MVPA | Intercept | -2.55 | 1.32 | -5.14, 0.03 | -1.86 | 1.27 | -4.35, 0.63 |
| Gendera | -0.09 | 0.36 | -0.08, 0.62 | 0.05 | 0.36 | -0.66, 0.76 | |
| School levelb | 0.74 | 0.38 | -0.01, 1.49 | 0.72 | 0.38 | -0.02, 1.46 | |
| BMI | 0.06 | 0.05 | -0.05, 0.16 | 0.05 | 0.05 | -0.06, 0.15 | |
| Time in segment | 0.06 | 0.00 | 0.05, 0.07 | 0.06 | 0.00 | 0.05, 0.07 | |
| PA groupc | 3.09 | 0.38 | 2.34, 3.83 | 3.69 | 0.43 | 2.86, 4.53 | |
| Total variance (%) | 52.63 | 51.64 | |||||
| In-school MVPA | Intercept | 8.43 | 2.08 | 4.35, 12.52 | 11.36 | 2.08 | 7.28, 15.44 |
| Gendera | -4.39 | 0.50 | -5.36, -3.42 | -4.45 | 0.51 | -5.46, -3.44 | |
| School levelb | -0.29 | 0.58 | -1.42, 0.83 | -0.54 | 0.59 | -1.70, 0.61 | |
| BMI | -0.08 | 0.07 | -0.23, 0.06 | -0.12 | 0.08 | -0.28, 0.02 | |
| Time in segment | 0.05 | 0.00 | 0.05, 0.06 | 0.05 | 0.00 | 0.05, 0.06 | |
| PA groupc | 5.33 | 0.53 | 4.30, 6.36 | 4.33 | 0.61 | 3.13, 5.53 | |
| Total variance (%) | 8.66 | 9.18 | |||||
| After-school MVPA | Intercept | -10.56 | 6.47 | -23.23, 2.12 | 0.62 | 6.99 | -13.09, 14.33 |
| Gendera | -0.99 | 1.33 | -3.60, 1.63 | -0.70 | 1.48 | -3.61, 2.21 | |
| School levelb | -1.63 | 1.46 | -4.49, 1.24 | -2.52 | 1.61 | -5.68, 0.64 | |
| BMI | -0.09 | 0.20 | -0.48, 0.30 | -0.27 | 0.22 | -0.07, 0.17 | |
| Time in segment | 0.09 | 0.01 | 0.08, 0.11 | 0.09 | 0.01 | 0.08, 0.11 | |
| PA groupc | 27.09 | 1.42 | 24.32, 29.87 | 25.64 | 1.77 | 22.18, 29.10 | |
| Total variance (%) | 16.00 | 24.85 | |||||
| Break time MVPA | Intercept | 3.47 | 0.85 | 1.80, 5.14 | 4.57 | 0.86 | 2.88, 6.26 |
| Gendera | -1.95 | 0.23 | -2.40, -1.50 | -1.97 | 0.24 | -2.44, -1.50 | |
| School levelb | -0.77 | 0.26 | -1.28, -0.25 | -0.86 | 0.27 | -1.39, -0.33 | |
| BMI | -0.02 | 0.03 | -0.08, 0.04 | -0.04 | 0.04 | -0.11, 0.03 | |
| Time in segment | 0.11 | 0.01 | 0.10, 0.13 | 0.11 | 0.01 | 0.10, 0.13 | |
| PA groupc | 2.01 | 0.24 | 1.54, 2.49 | 1.61 | 0.28 | 1.06, 2.17 | |
| Total variance (%) | 26.56 | 28.88 | |||||
| Physical education MVPA | Intercept | -3.44 | 2.41 | -8.16, 1.28 | -2.77 | 2.38 | -7.43, 1.89 |
| Gendera | -2.02 | 0.59 | -3.17, -0.87 | -1.89 | 0.60 | -3.06, -0.73 | |
| School levelb | 2.00 | 0.62 | 0.77, 3.22 | 1.91 | 0.63 | 0.68, 3.13 | |
| BMI | -0.13 | 0.09 | -0.30, 0.04 | -0.14 | 0.09 | -0.31, 0.03 | |
| Time in segment | 0.38 | 0.03 | 0.33, 0.43 | 0.38 | 0.03 | 0.33, 0.43 | |
| PA groupc | 2.65 | 0.61 | 1.45, 3.86 | 2.87 | 0.69 | 1.52, 4.21 | |
| Total variance (%) | 20.29 | 21.09 | |||||
| Class MVPA | Intercept | 2.74 | 1.12 | 0.54, 4.94 | 3.81 | 1.11 | 1.64, 5.98 |
| Gendera | -1.00 | 0.27 | -1.54, -0.47 | -1.03 | 0.28 | -1.58, -0.49 | |
| School levelb | -0.43 | 0.30 | -1.03, 0.16 | -0.52 | 0.31 | -1.13, 0.09 | |
| BMI | 0.01 | 0.04 | -0.07, 0.09 | -0.01 | 0.04 | -0.09, 0.08 | |
| Time in segment | 0.02 | 0.00 | 0.01, 0.02 | 0.02 | 0.00 | 0.01, 0.02 | |
| PA groupc | 1.78 | 0.29 | 1.21, 2.34 | 1.36 | 0.33 | 0.70, 2.01 | |
| Total variance (%) | 14.30 | 14.45 | |||||
aReference category: Boys.
bReference category: First school level.
cReference category: Non-compliant.
MVPA—moderate to vigorous physical activity; BMI—body mass index; PA group—physical activity group.