Head hits without diagnosed concussion (HHWDC)
| Intensified fair play | Non-intensified fair play | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Level | Team- games | HHWDC | Player- hours | Rate per 1000 player-hours (95% CI) | Team- games | HHWDC | Player- hours | Rate per 1000 player-hours (95% CI) | Risk ratio (95% CI) | p Value |
| Overall | 248 | 4 | 931.7 | 4.3 (1.2 to 11.0) | 126 | 8 | 438.7 | 18.2 (7.9 to 35.9) | 4.25 (1.28 to 14.11) | 0.018 |
| Bantam A | 46 | 0 | 174.2 | 0.0 (0.0 to 21.2) | 12 | 0 | 45.0 | 0.0 (0.0 to 82.0) | NA | |
| Bantam B | 60 | 3 | 225.0 | 13.3 (2.7 to 39.0) | 30 | 7 | 112.5 | 62.2 (25.0 to 128.2) | 4.67 (1.21 to 18.05) | 0.026 |
| Peewee A | 46 | 0 | 172.5 | 0.0 (0.0 to 21.4) | 24 | 0 | 72.7 | 0.0 (0.0 to 50.8) | NA | |
| Peewee B | 48 | 0 | 180.0 | 0.0 (0.0 to 20.5) | 22 | 0 | 66.0 | 0.0 (0.0 to 55.9) | NA | |
| Girls U14 A/B | 48 | 1 | 180.0 | 5.6 (0.1 to 31.0) | 38 | 1 | 142.5 | 7.0 (0.2 to 39.1) | 1.26 (0.08 to 20.19) | 0.869 |
NA, not applicable.