Risk factors for injury (adjusted for cluster)
| Risk factor | Percentage of missing data* | Athlete exposure hours | Number of injuries | Number of injuries/1000 player-hours | 95% CI | IRR 95% CI |
|---|---|---|---|---|---|---|
| Height: for each age group, the lowest 25th percentile of self-reported heights vs the remaining 75% of players (PSQ) | ||||||
| ≥25th percentile | 20.6% | 16431 | 31 | 1.8 | 1.6 to 3.0 | 1.0 |
| ≤25th percentile | 5785 | 9 | 1.5 | 0.9 to 2.5 | 0.8 (0.4 to 1.5) | |
| Weight: for each age group, the lowest 25th percentile of self-reported weights vs the remaining 75% of players. (PSQ) | ||||||
| ≥25th percentile | 16.3% | 17613 | 32 | 1.8 | 1.2 to 2.6 | 1.0 |
| ≤25th percentile | 5842 | 12 | 2.0 | 1.1 to 3.8 | 1.1 (0.6 to 2.0) | |
| Menarche: in PeeWee only, players who had begun to menstruate vs players who had not begun to menstruate. (Self-reported on the PSQ.) | ||||||
| Pre-Menarche | 2.7% | 2705 | 3 | 1.1 | 0.4 to 2.8 | 1.0 |
| Post-Menarche | 432 | 2 | 4.6 | 0.4 to 53.2 | 4.1 (1.0 to 16.8) | |
| Physical activity: for each age group, the lowest 25th percentile of self-reported PA levels in the week prior completing to the PSQ vs the remaining 75% of players. (Self-reported physical activity levels on the PSQ—reported in hours in any activity including gym class at school.) | ||||||
| ≥25th percentile | 12.6% | 17393 | 32 | 1.8 | 1.1 to 2.9 | 1.0 |
| ≤25th percentile | 7095 | 10 | 1.4 | 0.6 to 2.8 | 0.7 (0.3 to 1.6) | |
| Position of play: position of play as self reported on the PSQ at preseason | ||||||
| Defence | 5.8% | 8198 | 14 | 1.7 | 0.8 to 3.2 | 1.0 |
| Forward | 15059 | 26 | 1.7 | 1.1 to 2.7 | 1.0 (0.5 to 2.0) | |
| Goalie | 3022 | 8 | 2.6 | 1.4 to 4.8 | 1.5 (0.6 to 3.8) | |
| Ice hockey experience: atom: ≥3 years ice hockey experience vs <2 years experience. PeeWee: ≥5 vs <4 years experience. Bantam: ≥7 vs <6 years experience. Midget: ≥9 years vs those with <8 years experience. (Self reported on the PSQ.) | ||||||
| High ice hockey experience | 0.0% | 11664 | 21 | 1.8 | 1.1 to 2.8 | 1.0 |
| Low ice hockey experience | 16080 | 32 | 1.9 | 1.1 to 3.4 | 1.1 (0.5 to 2.3) | |
| Previous injury: all players self-reporting ≥1 previous injury (defined as ‘any injury in the previous year that lead to medical attention or time loss from sport’) on the PSQ vs those reporting no previous injury | ||||||
| No previous injury | 5.8% | 19 415 | 23 | 1.1 | 0.8 to 1.7 | 1.0 |
| Yes previous injury | 6851 | 22 | 3.2 | 2.0 to 4.9 | 2.7 (1.7 to 4.3) | |
| Relative age: for Atom, PeeWee and Bantam: players in their first year of eligibility versus second year of eligibility. For Midget only: players in their first year of eligibility versus players in their second or third year of eligibility | ||||||
| Relative age—2nd/3rd year | 5.8% | 10 205 | 19 | 1.8 | 1.2 to 2.9 | 1.0 |
| Relative age—1st year | 16 187 | 30 | 1.8 | 1.1 to 2.9 | 1.0 (0.5 to 1.6) | |
| Session type: injuries occurring in practices vs games as reported by the team therapist on the injury report form | ||||||
| Practice | 0.0% | 11 319 | 13 | 1.1 | 0.6 to 2.0 | 1.0 |
| Game | 16 425 | 39 | 2.3 | 1.7 to 3.2 | 2.1 (1.1 to 4.2) | |
Variables dichotomised by 25% of the population who were hypothesised by the authors to be at increased risk of injury over the remaining 75% of the population (ie,: low weight, height, physical activity level and ice hockey experience).
*Number of players with data/total players in the study (324).
PSQ, Preseason Questionnaire.