ACL injury, n (%) | Hazard ratio for injury | |||||||
Present | Absent (%) | Unadjusted | Adjusted* | |||||
Male | Female | Male | Female | Male | Female | Male | Female | |
Frequency of participation in sports clubs | ||||||||
⩾4–5 times/week | 60 (2.0) | 22 (1.6) | 2890 (98.0) | 1381 (98.4) | 4.5 (3.2 to 6.5) | 11.7 (6.6 to 20.7) | 4.0 (2.7 to 6.1) | 8.5 (4.3 to 16.4) |
⩽2 to 3 times/week | 74 (1.0) | 23 (0.3) | 7048 (99.0) | 7287 (99.7) | 2.1 (1.5 to 3.0) | 2.1 (1.2 to 3.7) | 2.0 (1.4 to 2.9) | 2.0 (1.1 to 8.6) |
Never | 56 (0.5) | 26 (0.2) | 10672 (99.5) | 15860 (99.8) | 1 | 1 | 1 | 1 |
Frequency of other physical exercise | ||||||||
⩾4 to 5 times/week | 51 (1.0) | 22 (0.4) | 5140 (99.0) | 5168 (99.6) | 2.0 (0.7 to 5.4) | N/A | 1.9 (0.6 to 5.7) | N/A |
⩽2 to 3 times/week | 137 (0.9) | 48 (0.3) | 14,752 (99.1) | 18845 (99.7) | 1.9 (0.6 to 4.6) | 1.8 (0.6 to 5.7) | ||
Never | 4 (0.4) | 0 (0) | 928 (99.6) | 756 (100) | 1 | 1 |
N/A, not applicable.
*Adjusted for father’s or other guardian’s occupation, family composition, urbanisation level of residence, perceived health status, chronic disease, number of stress symptoms weekly, overweight, smoking, drinking style and timing of puberty.