Table 7.
Effects of household / family characteristics, school characteristics and adolescent’s characteristics on adolescent’s moderate-to-vigorous physical activity at school (sub-samplea), and the moderating effects of adolescent’s gender (Step 3 of mediation analysis)
| Household / family characteristics | Effect | Average MVPA (min/day) at school during school hours | Average MVPA (min/day) after school hours | ||
|---|---|---|---|---|---|
| eb (95% CI) | p | eb (95% CI) | p | ||
| Highest educational attainment in the household | Main - direct | 1.02 (0.98,1.06) | 0.399 | 1.06 (1.01,1.11) | 0.029 |
| Number of motor vehicles in the household | Main - direct | 0.99 (0.93,1.06) | 0.816 | 0.99 (0.92,1.07) | 0.849 |
| Number of children in the household | Main - direct | 0.93 (0.87,0.99) | 0.018 | 0.99 (0.93,1.07) | 0.891 |
| Neighbourhood self-selection related to PA | Main -direct | 0.98 (0.92,1.04) | 0.462 | 1.02 (0.94,1.10) | 0.642 |
| Neighbourhood socio-economic status | Main - direct | 1.35 (1.18,1.54) | < 0.001 | 1.11 (0.97,1.26) | 0.124 |
| Household income | Main - direct | 0.99 (0.97,1.01) | 0.337 | 0.99 (0.96,1.01) | 0.309 |
| Parental rules for PA | Main - direct | 0.98 (0.97,0.99) | 0.005 | 0.99 (0.97,1.00) | 0.084 |
| Social support for PA from parents | Main - direct | 0.99 (0.93,1.04) | 0.605 | 1.03 (0.96,1.10) | 0.399 |
| PA equipment at home / neighbourhood | Main - direct | 0.99 (0.97,1.01) | 0.542 | 0.99 (0.97,1.01) | 0.396 |
| Parental leisure-time PA^ | Main - direct | 1.00 (0.99,1.01) | 0.655 | 0.99 (0.98,1.00) | 0.025 |
| Parental transportation PA^ | Main - direct | 1.00 (0.99,1.01) | 0.735 | 1.01 (0.99,1.02) | 0.275 |
| School Characteristics | |||||
| School PA-friendly index‡ | Main - direct | 0.99 (0.96,1.02) | 0.462 | 1.02 (0.98,1.06) | 0.285 |
| In boys | N/A | N/A | 0.98 (0.93,1.03) | 0.455 | |
| In girls | N/A | N/A | 1.06 (1.02,1.12) | 0.008 | |
| Social support from peers | Main - direct | 1.00 (0.95,1.04) | 0.884 | 0.97 (0.92,1.02) | 0.287 |
| Adolescent’s characteristics | |||||
| Attitude towards PA | Main - direct | 1.13 (0.99,1.29) | 0.073 | 1.09 (0.93,1.28) | 0.275 |
| Enjoyment of PA | Main - direct | 1.03 (0.97,1.08) | 0.332 | 1.07 (1.01,1.15) | 0.032 |
| Athletic ability | Main - direct | 1.04 (0.99,1.09) | 0.104 | 1.03 (0.97,1.09) | 0.373 |
a sub-sample of adolescents who wore accelerometer; MVPA = moderate to vigorous physical activity; eb = exponentiated regression coefficient
CI = confidence interval; PA = physical activity; ^ minutes converted to hours (by dividing by 60); ‡ consisting of items measuring PA equipment at school and school PA-friendly policy supporting after-school PA; N/A denotes ‘no significant interaction’. These regression models were adjusted for confounders listed in Table S6