Injury incidence among players randomised to the control, regular and comprehensive intervention groups, and among players stratified into high, medium and low adherence
| Randomisation | Adherence | ||||||
|---|---|---|---|---|---|---|---|
| Injury incidence per 1000 exposure (95% CI) | Crude IRR (95% CI) | Adjusted IRR (95% CI)* | Injury incidence per 1000 exposure (95% CI) | Crude IRR (95% CI) | Adjusted IRR (95% CI)* | ||
| All injuries | |||||||
| Comprehensive | 5.2 (2.4 to 11.5) | 0.81 (0.3 to 1.92) | 1.09 (0.50 to 2.37) | High | 2.7 (1.1 to 6.6) | 0.47 (0.15 to 1.43) | 0.46 (0.14 to 1.49) |
| Regular | 7.2 (4 to 12.9) | 1.12 (0.56 to 2.23) | 1.45 (0.33 to 6.36) | Medium | 10.8 (7.6 to 15.4) | 1.90 (0.88 to 4.09) | 1.66 (0.76 to 3.65) |
| Control | 6.4 (4.2 to 9.8) | – | – | Low | 5.7 (2.8 to 11.4) | – | – |
| Lower extremity injuries | |||||||
| Comprehensive | 3.7 (1.5 to 9.4) | 0.62 (0.23 to 1.63) | 0.83 (0.33 to 2.08) | High | 2.7 (1.1 to 6.6) | 0.51 (0.16 to 1.63) | 0.51 (0.16 to 1.64) |
| Regular | 7.2 (4 to 12.9) | 1.19 (0.59 to 2.42) | 1.95 (0.44 to 8.71) | Medium | 9.2 (6.2 to 13.7) | 1.78 (0.79 to 4.02) | 1.57 (0.72 to 3.42) |
| Control | 6 (3.8 to 9.4) | – | – | Low | 5.2 (2.4 to 11.1) | – | – |
The control and low adherence groups served as respective reference groups. Injury incidences and incidence rate ratios are presented with mean and 95% CI.
*Adjusted for cluster, age groups, level of play (tier) and previous injury (back or lower extremity injury in the 6 weeks prior to study start).
IRR, injury rate ratio.