Estimated long-term treatment effect of 6 years of the LF intervention on Z-WRpeak and PA-Days
| N | Regular school group (mean) | Lekker fit! group (mean) | Effect of intervention (95% CI) | |
| WRpeak z-score | X | −0.08 (−0.17 to 0.01) | −0.26 (−0.33 to −0.17) | −0.18 (−0.29 to −0.06) |
| PA-Days (days/week) | X | 4.11 (3.96 to 4.27) | 3.99 (3.82 to 4.17) | −0.12 (−0.36 to 0.12) |
Results are the average treatment effects on the standardised achieved proportion of the predicted highest achieved work rate, and number of days with at least 1 hour of PA, obtained from a linear regression model on propensity score matched sample. The propensity score matched sample was matched on age, gender, ethnic background, maternal educational level, paternal educational level, net household income, sport participation, playing outside and BMI-sds.
Significance at the 0.05 level is indicated in bold.
85%-HR-sample: sample only including participants with ≥85% achieved proportion of the predicted absolute heart rate to account for the role of motivation.
LF, Lekker Fit!; PA-Days, days with at least 1 hour of physical activity; WRpeak z-score, standardised achieved proportion of the predicted highest achieved work rate.