Table 2.
Concussions
| Intensified fair play |
Non-intensified fair play |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Level | Team- games | Concussions | Player- hours | Rate per 1000 player-hours (95% CI) | Team- games | Concussions | Player- hours | Rate per 1000 player-hours (95% CI) | Risk ratio (95% CI) | p Value |
| Overall | 248 | 2 | 931.7 | 2.2 (0.3 to 7.8) | 126 | 1 | 438.7 | 2.3 (0.1, 12.7) | 1.06 (0.1 to 11.7) | 0.961 |
| Bantam A | 46 | 0 | 174.2 | 0 (0.0 to 21.2) | 12 | 0 | 45.0 | 0.0 (0.0 to 82.0) | NA | |
| Bantam B | 60 | 1 | 225.0 | 4.4 (0.1 to 24.8) | 30 | 1 | 112.5 | 8.9 (0.2 to 49.5) | 2.00 (0.13 to 32.0) | 0.624 |
| Peewee A | 46 | 0 | 172.5 | 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 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 | 0 | 142.5 | 0.0 (0.0 to 25.9) | 0.42 (0.02 to 10.34)* | 0.596* |
*Analysed using a penalised likelihood approach in logistic regression.