Characteristics of participants
| Boys (n=568) | Girls (n=162) | P values | |
| Age, years | 11.7 (1.1; 9–14) | 11.8 (1.1; 9–14) | 0.27 |
| Height (cm)* | 151.7 (10.0; 124.0–186.5) | 151.6 (9.2; 132.5–169.8) | 0.99 |
| Weight (kg)* | 41.2 (8.7; 22.5–80.5) | 41.6 (7.7; 28.6–60.0) | 0.59 |
| BMI (kg/m2)* | 17.7 (1.9; 13.9–26.7) | 17.9 (1.7; 13.8–23.3) | 0.10 |
| Normal weight (%) | 91.4 | 96.5 | 0.06 |
| Underweight (%) | 4.0 | 3.5 | |
| Overweight (%) | 4.6 | 0.0 | |
| Playing years | 6.3 (1.7; 1–10) | 5.1 (1.7; 0–9) | <0.001 |
| Previous orthopaedic surgical procedures (n, yes/no) | 54/499 | 10/151 | 0.17 |
| Currently participating in other sports (n, yes/no) | 96/458 | 25/136 | 0.60 |
| Menarche (n, yes/no) | – | 25/135 | – |
Mean (SD; range).
*Available from 454 boys and 114 girls.
BMI, body mass index.