Four Separate Mixed-Effects Models With Random Intercept and Slope Examining the Change of PA and SB Between Age 6 and 11 Years (Model 1)
| . | SB . | Total PA . | LPA . | MVPA . | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| β . | 95% CI . | P . | β . | 95% CI . | P . | β . | 95% CI . | P . | β . | 95% CI . | P . | |
| Fixed effects | ||||||||||||
| Intercept | 274.8 | 258.8 to 290.9 | <.001 | 520.4 | 503.9 to 537.0 | <.001 | 428.8 | 415.2 to 442.3 | <.001 | 82.3 | 73.0 to 92.8 | <.001 |
| Sex (boys) | 9.2 | −2.2 to 20.6 | .115 | −1.0 | −12.8 to 10.8 | .867 | −21.7 | −34.1 to −9.4 | <.001 | 21.3 | 10.5 to 32.2 | <.001 |
| Country | ||||||||||||
| Spain | 11.7 | −6.6 to 30.0 | .210 | 23.6 | 4.7 to 42.5 | .015 | 6.9 | −8.1 to 21.9 | .370 | 10.5 | −0.8 to 23.4 | .073 |
| Germany | −.8 | −21.5 to 19.8 | .936 | 27.9 | 6.6 to 49.3 | .010 | 6.4 | −10.7 to 23.4 | .464 | 14.3 | 0.8 to 29.9 | .034 |
| Italy | 39.9 | 20.9 to 58.9 | <.001 | 5.1 | −14.6 to 24.7 | .615 | −6.0 | −21.7 to 9.7 | .455 | −3.2 | −12.9 to 8.7 | .610 |
| Poland | 39.1 | 19.3 to 58.9 | <.001 | 4.4 | −16.0 to 24.8 | .672 | −9.7 | −26.0 to 6.6 | .244 | 7.8 | −4.8 to 21.3 | .235 |
| Age (centered) | 10.8 | 4.4 to 17.2 | .001 | −.6 | −7.5 to 6.3 | .860 | −6.4 | −8.7 to −4.0 | <.001 | 3.4 | −1.6 to 8.7 | .161 |
| Age × age (centered) | 1.8 | 0.7 to 2.9 | .001 | −2.6 | −3.8 to −1.4 | <.001 | — | — | — | −2.4 | −3.2 to −1.6 | <.001 |
| Sex × age (centered) | — | — | — | — | — | — | −5.3 | −8.8 to −1.8 | .003 | 5.1 | 2.5 to 7.8 | <.001 |
| . | SB . | Total PA . | LPA . | MVPA . | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| β . | 95% CI . | P . | β . | 95% CI . | P . | β . | 95% CI . | P . | β . | 95% CI . | P . | |
| Fixed effects | ||||||||||||
| Intercept | 274.8 | 258.8 to 290.9 | <.001 | 520.4 | 503.9 to 537.0 | <.001 | 428.8 | 415.2 to 442.3 | <.001 | 82.3 | 73.0 to 92.8 | <.001 |
| Sex (boys) | 9.2 | −2.2 to 20.6 | .115 | −1.0 | −12.8 to 10.8 | .867 | −21.7 | −34.1 to −9.4 | <.001 | 21.3 | 10.5 to 32.2 | <.001 |
| Country | ||||||||||||
| Spain | 11.7 | −6.6 to 30.0 | .210 | 23.6 | 4.7 to 42.5 | .015 | 6.9 | −8.1 to 21.9 | .370 | 10.5 | −0.8 to 23.4 | .073 |
| Germany | −.8 | −21.5 to 19.8 | .936 | 27.9 | 6.6 to 49.3 | .010 | 6.4 | −10.7 to 23.4 | .464 | 14.3 | 0.8 to 29.9 | .034 |
| Italy | 39.9 | 20.9 to 58.9 | <.001 | 5.1 | −14.6 to 24.7 | .615 | −6.0 | −21.7 to 9.7 | .455 | −3.2 | −12.9 to 8.7 | .610 |
| Poland | 39.1 | 19.3 to 58.9 | <.001 | 4.4 | −16.0 to 24.8 | .672 | −9.7 | −26.0 to 6.6 | .244 | 7.8 | −4.8 to 21.3 | .235 |
| Age (centered) | 10.8 | 4.4 to 17.2 | .001 | −.6 | −7.5 to 6.3 | .860 | −6.4 | −8.7 to −4.0 | <.001 | 3.4 | −1.6 to 8.7 | .161 |
| Age × age (centered) | 1.8 | 0.7 to 2.9 | .001 | −2.6 | −3.8 to −1.4 | <.001 | — | — | — | −2.4 | −3.2 to −1.6 | <.001 |
| Sex × age (centered) | — | — | — | — | — | — | −5.3 | −8.8 to −1.8 | .003 | 5.1 | 2.5 to 7.8 | <.001 |
All values are min per d; reference for “country” variable is Belgium; age was centered to the lowest age of any participant (5.89 y). CI, confidence interval; —, not applicable.