Incidence rate ratios for targeted injuries, stratified by region (head and neck, shoulder and lower limb) based on Poisson regression analysis adjusted for cluster and playing level
| Target injury and arm | Clubs (n) | Player match-hours | Injuries/days lost count | IIR(90% CI) | RR (90% CI) | Magnitude-based inference (beneficial/trivial/harmful) (%) |
| Head and neck incidence | ||||||
| Control | 19 | 9660 | 35 | 3.6 (2.7 to 4.8) | 0.3 (0.2 to 0.7) | Very likely beneficial (99/1/0) |
| Intervention | 22 | 9900 | 12 | 1.2 (0.8 to 1.9) | ||
| Concussion incidence | ||||||
| Control | 19 | 9660 | 33 | 3.4 (2.6 to 4.5) | 0.4 (0.2 to 0.7) | Very likely beneficial (99/1/0) |
| Intervention | 22 | 9900 | 12 | 1.2 (0.8 to 1.9) | ||
| Shoulder Incidence | ||||||
| Control | 19 | 9660 | 10 | 1.0 (0.6 to 1.7) | 1.7 (0.7 to 3.8) | Likely harmful (11/10/79) |
| Intervention | 22 | 9900 | 17 | 1.7 (1.2 to 2.6) | ||
| Lower-limb incidence | ||||||
| Control | 19 | 9660 | 50 | 5.2 (4.1 to 6.5) | 0.6 (0.4 to 1.0) | Likely beneficial (89/9/2) |
| Intervention | 22 | 9900 | 33 | 3.3 (2.5 to 4.4) | ||
| Head and neck burden | ||||||
| Control | 19 | 9660 | 1164 | 120 (92 to 159) | 0.3 (0.2 to 0.7) | Very likely beneficial (99/1/0) |
| Intervention | 22 | 9900 | 378 | 38 (24 to 61) | ||
| Concussion burden | ||||||
| Control | 19 | 9660 | 983 | 102 (76 to 136) | 0.4 (0.2 to 0.8) | Very likely beneficial (97/2/1) |
| Intervention | 22 | 9900 | 378 | 38 (24 to 61) | ||
| Shoulder burden | ||||||
| Control | 19 | 9660 | 436 | 45 (27 to 76) | 1.5 (0.6 to 3.7) | Possibly harmful (17/11/71) |
| Intervention | 22 | 9900 | 673 | 68 (46 to 101) | ||
| Lower-limb burden | ||||||
| Control | 19 | 9660 | 3688 | 382 (303 to 482) | 0.6 (0.3 to 1.5) | Unclear (75/11/14) |
| Intervention | 22 | 9900 | 2421 | 245 (184 to 326) | ||
IIR, injury incidence rate; RR, rate ratio.