Mean annual change in sedentary time and in light and moderate and vigorous physical activity (MVPA) over three time points: baseline (age 9/10 years), +1 year (age 10/11 years) and +4 years (age 13/14 years)
| Sedentary (min) | Light intensity PA (min) | MVPA (min) | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Subgroup | B | 95% CI | B | 95% CI | B | 95% CI | |||
| Overall | 10.6 | 9.0 | 12.2 | −9.8 | −10.7 | −8.9 | −2.9 | −3.5 | −2.3 |
| Sex | |||||||||
| Boys | 11.5 | 9.0 | 14.0 | −8.9 | −10.1 | −7.8* | −3.9 | −4.8 | −3.0* |
| Girls | 10.0 | 8.1 | 11.9 | −10.8 | −11.7 | −9.9* | −2.0 | −2.7 | −1.2* |
| Day of the week | |||||||||
| Weekday | 8.3 | 6.0 | 10.6* | −9.4 | −10.3 | −8.5 | −2.8 | −3.7 | −1.9* |
| Weekend | 13.4 | 10.2 | 16.5* | −10.5 | −11.9 | −9.1 | −6.7 | −8.1 | −5.2* |
| Home location | |||||||||
| Urban | 9.7 | 7.1 | 12.2 | −11.0 | −12.4 | −9.6* | −1.3 | −2.3 | −0.4* |
| Town | 9.9 | 6.6 | 13.1 | † | −2.9 | −4.0 | −1.9* | ||
| Rural | 12.1 | 9.9 | 14.3 | −8.5 | −10.1 | −6.9* | −4.4 | −5.2 | −3.5* |
| Weight status | |||||||||
| Normal weight | 11.8 | 10.1 | 13.4* | −9.5 | −10.5 | −8.6* | −3.3 | −4.0 | −2.5 |
| Overweight or obese | 6.9 | 3.8 | 10.0* | −10.2 | −12.4 | −8.1* | −2.1 | −3.4 | −0.8 |
| Parental education (years) | |||||||||
| ≤16 | 10.5 | 8.4 | 12.6 | −10.5 | −12.0 | −9.0 | −2.8 | −3.8 | −1.7 |
| >16 | 10.7 | 8.7 | 12.7 | −9.4 | −10.3 | −8.4 | −2.9 | −3.6 | −2.2 |
Results are from three level mixed effects linear regression models adjusted for sex and stratified to estimate subgroup effects. Values are mean change (min/day/year) with 95% CIs. Participants with valid data at ≥2 time points (n=990) were included in the models except when run separately for weekdays (n=980) and weekend days (n=815). β Coefficients represent the per year changes in the physical activity outcomes.
*Significant interaction.
†This model did not converge.
MVPA, moderate and vigorous physical activity; PA, physical activity.