Sample characteristics, stratified by sex, of children and parents; values are mean (SD), except where specified as %
| Characteristic | All | Male | Female |
| Child | n=1731–1872 | n=898–954 | n=833–918 |
| Age, years | 12.0 (0.4) | 12.0 (0.4) | 12.0 (0.4) |
| Pubertal status, % | |||
| Prepubertal | 8.5 | 12.0 | 4.5 |
| Early pubertal | 24.4 | 40.0 | 6.7 |
| Mid-pubertal | 52.5 | 42.2 | 64.1 |
| Late postpubertal | 14.6 | 5.8 | 24.6 |
| Parent | n=1847–1852 | n=226–229 | n=1621–1623 |
| Age, years | 43.7 (5.6) | 46.4 (7.1) | 43.3 (5.3) |
| Disadvantage index | 1009 (61) | 1005 (69) | 1009 (61) |
| Disadvantage index quintile, % | |||
| 1 (most disadvantaged) | 12.3 | 13.8 | 12.2 |
| 2 | 18.1 | 22.7 | 17.5 |
| 3 | 21.3 | 21.9 | 21.2 |
| 4 | 22.6 | 14.9 | 23.7 |
| 5 (least disadvantaged) | 25.6 | 26.7 | 25.5 |
Sample weights applied to data.