Outcome | Injury | Severe injury | Concussion | Concussion (time loss>10 days) | ||||
---|---|---|---|---|---|---|---|---|

2011–2012 | 2013–14 | 2011–12 | 2013–14 | 2011–12 | 2013–14 | 2011–12 |
2013–14
| |

No of players | 883 | 618 | 883 | 618 | 883 | 618 | 883 | 618 |

No of injuries or concussions | 163 | 48 | 71 | 17 | 104 | 25 | 42 | 14 |

Athlete participation (hours) | 37 273.87 | 22 259.08 | 37 273.87 | 22 259.08 | 37 273.87 | 22 259.08 | 37 273.87 | 22 259.08 |

Injury rate, injuries per 1000 player-hours (95% CI)* | 4.37 (3.59 to 5.33) | 2.16 (1.56 to 2.99) | 1.90 (1.48 to 2.44) | 0.76 (0.48 to 1.23) | 2.79 (2.28 to 3.41) | 1.12 (0.75 to 1.69) | 1.13 (0.83 to 1.53) | 0.63 |

Incidence rate ratio (unadjusted for covariates) | 1 (Reference) | 0.49 | 1 (Reference) | 0.40 | 1 (Reference) | 0.40 | 1 (Reference) | 0.56 |

(0.34 to 0.72) | (0.24, 0.68) | (0.26, 0.63) | (0.31, 1.01) | |||||

Absolute risk reduction associated with removal of checking, injuries per 1000 player-hours (95% CI) | 2.22 | 1.14 | 1.67 | 0.50 | ||||

(1.31 to 3.12) | (0.57 to 1.71) | (0.97 to 2.36) | (0.02 to 0.97) | |||||

No of injuries saved in one season in Alberta (95% CI)† | 772 (456 to 1085) | 396 (198 to 595) | 581 (337 to 821) | 174 (7 to 337) | ||||

No of injuries saved in one season in Canada (95% CI)‡ | 6388 (3770 to 8978) | 3281 (1640 to 4921) | 4806 (2791 to 6791) | 1439 (58 to 2791) |

*IRRs based on Poisson regression analysis offset for exposure hours, adjusted for clustering by team, unadjusted for covariates.

†The population of Pee Wee players from Alberta is 8768. The average game-hours is 39.66 per Pee Wee player. The number of injuries saved is calculated using Alberta population participation and the absolute risk reduction. The number of injuries and confidence limits are rounded to the nearest integer.

‡The population of Pee Wee players from Canada is 72 555. The average game-hours from this population is 39.66 per Pee Wee player. The number of injuries saved is calculated using Hockey Canada population participation and the absolute risk reduction. The number of injuries and confidence limits are rounded to the nearest integer.