Descriptives of the study sample at baseline
| Boys (n=319) | Girls (n=314) | |
| Age (years) | 12.5±1.3 | 12.3±1.3 |
| Height (cm) | 156.1±11.7 | 154.1±9.6 |
| Weight (kg) | 46.1±12.9 | 44.8±10.5 |
| BMI (kg/m2) | 18.6±3.3 | 18.7±3.1 |
| 20MSRT (laps) | 45.3±19.0 | 36.4±15.2 |
| 20MSRT centile* | 60th | 70th |
| MVPA (min/day) | 58.0±22.4 | 48.3±17.9 |
| Pubertal status† | 2.6±1.0 | 2.5±0.9 |
Units are means and SD unless other mentioned.
*International normative values by Tomkinson et al, 2016.
†Classification is based on self-assessment questionnaire and Tanner’s scale.
BMI, body mass index; 20MSRT, 20-m shuttle run test; MVPA, accelerometry-based moderate-to-vigorous physical activity.