Table 2. Analysis of Cardiorespiratory Fitness Measured by Laps on Multistage 20-m Shuttle Run Test.
| Model | Follow-up, mo | Total No. (No. in intervention) | No. of laps (95% CI) | ||
|---|---|---|---|---|---|
| Change from baseline, control | Change from baseline, intervention | Adjusted difference between intervention and control in 20-m shuttle test laps | |||
| Main analysisa: controlling for schools' remoteness and Index of Community Socio-Educational Advantage score | 12 | 993 (440) | 2.11 (1.38-2.85) | 3.32 (2.44-4.2) | 1.20 (0.17-2.24) |
| 24 | 864 (375) | 4.42 (3.41-5.43) | 6.64 (5.3-7.98) | 2.22 (0.89-3.55) | |
| Sensitivity analysis 1b: model without controlling for schools' remoteness or Index of Community Socio-Educational Advantage score | 12 | 993 (440) | 1.74 (1.17-2.31) | 2.75 (2.1-3.4) | 1.01 (0.14-1.88) |
| 24 | 864 (375) | 3.63 (2.92-4.34) | 5.5 (4.61-6.4) | 1.87 (0.73-3.02) | |
| Sensitivity analysis 2a: model controlling for schools' urban status and Index of Community Socio-Educational Advantage score and imputing missing data | 12 | 1021 (459) | 2.01 (1.27-2.76) | 3.36 (2.46-4.26) | 1.35 (0.27-2.43) |
| 24 | 970 (408) | 4.56 (3.53-5.59) | 7.22 (5.8-8.65) | 2.66 (1.23-4.08) | |
a
Main analysis = mixed effect model with a Poisson link function. ICC student = 0.86, ICC teacher = 0.06, ICC School = 0.04.
b
Sensitivity analyses 2 a and b included imputation for students who were absent during a primary outcome assessment, but provided other assessment data at that time point. The median absolute deviation in shuttle runs for the control group was 8 laps (at baseline). The intervention effect size was equivalent to 15% of the median absolute deviation at 12 months and 28% of the median absolute deviation at 24 months.