Overall time-loss injury incidence rates by league in 2018 (estimated) and 2019 (actual)
| 2018 (807 players) | 2019 (906 players) | IR | 95% CI | P value | |||||||
| n | IP% | I | 95% CI | n | IP% | I | 95% CI | ||||
| First | 35 | 4.3 | 29.2 | 19.5 to 38.8 | 44 | 4.9 | 24.9 | 17.5 to 32.2 | 0.85 | 0.5 to 1.4 | 0.49 |
| Second | 30 | 3.7 | 50.0 | 32.1 to 67.9 | 9 | 1.0 | 14.3 | 5.0 to 23.6 | 0.29 | 0.1 to 0.6 | <0.001 |
| Third | 9 | 1.1 | 17.6 | 6.1 to 29.2 | 23 | 2.5 | 33.3 | 19.7 to 47.0 | 1.89 | 0.8 to 4.6 | 0.11 |
| Fourth | 15 | 1.9 | 25.0 | 12.3 to 37.7 | 7 | 0.8 | 21.5 | 5.6 to 37.5 | 0.86 | 0.3 to 2.2 | 0.83 |
| Second-Fourth | 54 | 6.7 | 31.6 | 23.2 to 40.0 | 39 | 4.3 | 23.8 | 16.3 to 31.1 | 0.75 | 0.5 to 1.2 | 0.18 |
I, incidence rate per 1000 hours; IP%, n, total registered players; IR, incidence rate ratio; SRC, sport-related concussion.