Subgroup analysis for the estimated long-term treatment effect of the LF intervention on WRpeak z-score and PA-Days
| Subgroups | WRpeak z-score | PA-Days | |||
| Effect of intervention (95% CI) | Subgroup effect Z-test (P value) | Effect of intervention (95% CI) | Subgroup effect Z-test (P value) | ||
| Gender | Boys | −0.17 (−0.34 to −0.00) | 0.22 (0.83) | 0.10 (−0.27 to 0.46) | 1.66 (0.10) |
| Girls | −0.19 (−0.33 to −0.06) | −0.33 (−0.69 to 0.03) | |||
| Ethnic background | Native Dutch | −0.17 (−0.29 to −0.04) | 1.15 (0.25) | −0.05 (-0.37 to 0.26) | 0.36 (0.72) |
| Non-native Dutch | −0.28 (−0.42 to −0.13) | −0.14 (−0.49 to 0.21) | |||
| Net household income | < €3200 per month | −0.13 (−0.27 to 0.01) | 0.08 (0.94) | −0.23 (−0.58 to 0.12) | 0.35 (0.72) |
| > €3200 per month | −0.14 (−0.34 to 0.06) | −0.13 (−0.58 to 0.32) | |||
| Pre-intervention weight status | No overweight | −0.18 (−0.29 to −0.06) | 0.07 (0.94) | −0.16 (−0.44 to 0.12) | 0.51 (0.61) |
| Overweight | −0.19 (−0.46 to 0.09) | 0.02 (−0.63 to 0.67) | |||
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. Differences were assessed by conducting stratified analysis and by testing for differences in effect parameters using z-tests.
Significance for the subgroup effect at the 0.05 level is indicated in bold.
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.