Table 1. Characteristics of the sample.
| Boys (196) | Girls (176) | p-value | |
|---|---|---|---|
| Chronological age at baseline (years) | 8.9±1.1 | 9.0±1.1 | 0.751 |
| Age at peak height velocity (years) | 13.1±0.4 | 11.9±0.3 | <0.001 |
| Somatic maturity status | 0.615 | ||
| Late maturing (n) | 36 | 31 | |
| On time maturing (n) | 129 | 123 | |
| Early maturing (n) | 31 | 22 | |
| 9-min running baseline (m) | 1334.5±172.6 | 1223.2±172.6 | <0.001 |
| 9-min running 1 year (m) | 1355.0±228.7 | 1220.1±200.8 | <0.001 |
| 9-min running 2 years (m) | 1392.2±218.1 | 1230.1±186.8 | <0.001 |
| 9-min running 3 years (m) | 1561.9±342.0 | 1334.9±232.5 | <0.001 |
| Sum of skinfolds* baseline (mm) | 23.5±11.8 | 25.7±10.8 | 0.003 |
| Sum of skinfolds* 3 years (mm) | 33.5±16.3 | 33.9±13.6 | 0.206 |
*Triceps and subscapular skinfolds.