Associations between team season injury rates (dependent variable) and winter break (explanatory variable) in the crude analyses and between team season injury rates (dependent variable) and the explanatory variables ‘winter break’ and ‘climate region’
| Dependent variable | Crude analyses | Adjusted analyses | Mean teams without winter break | Mean teams with winter break | ||||||
| β for winter break (95% CI) | P values for winter break | Effect size (r) | β for winter break (95% CI) | P values for winter break | β for climatic region (95% CI) | P values for climatic region | Effect size (r) | |||
| Injury burden | ||||||||||
| Whole season | 58.8 (40.6 to 77.0) | <0.001 | 0.404 | 43.3 (23.9 to 62.7) | <0.001 | 42.2 (20.2 to 64.3) | <0.001 | 0.465 | 185.9 | 127.0 |
| August to December | 55.7 (31.3 to 80.0) | <0.001 | 0.298 | 32.6 (6.9 to 58.4) | 0.013 | 62.9 (33.6 to 92.1) | <0.001 | 0.401 | 202.1 | 146.5 |
| January to March | 79.1 (50.2 to 108.0) | <0.001 | 0.351 | 66.6 (35.2 to 98.1) | <0.001 | 34.4 (–1.7 to 70.5) | 0.062 | 0.371 | 199.3 | 120.3 |
| April to May | 48.9 (13.9 to 83.9) | 0.006 | 0.191 | 38.2 (–0.1 to 76.4) | 0.050 | 29.6 (–13.8 to 73.0) | 0.181 | 0.212 | 171.2 | 122.3 |
| Severe injury incidence | ||||||||||
| Whole season | 0.5 (0.3 to 0.7) | <0.001 | 0.334 | 0.3 (0.1 to 0.5) | 0.002 | 0.5 (0.3 to 0.7) | <0.001 | 0.430 | 1.6 | 1.1 |
| August to December | 0.5 (0.3 to 0.8) | <0.001 | 0.263 | 0.3 (–0.0 to 0.5) | 0.062 | 0.7 (0.4 to 1.0) | <0.001 | 0.388 | 1.8 | 1.3 |
| January to March | 0.7 (0.4 to 1.0) | <0.001 | 0.291 | 0.5 (0.2 to 0.8) | 0.003 | 0.5 (0.1 to 0.9) | 0.012 | 0.334 | 1.7 | 1.0 |
| April to May | 0.3 (–0.1 to 0.6) | 0.133 | 0.106 | 0.1 (–0.3 to 0.5) | 0.502 | 0.4 (–0.0 to 0.8) | 0.081 | 0.162 | 1.3 | 1.0 |
| Team training attendance | ||||||||||
| Whole season | –1.3 (–2.6 to 0.0) | 0.053 | –0.133 | 0.2 (–1.2 to 1.6) | 0.778 | –4.1 (–5.7 to –2.5) | <0.001 | 0.360 | 82.7% | 84.1% |
| August to December | –0.5 (–2.1 to 1.2) | 0.583 | –0.038 | 1.2 (–0.5 to 3.0) | 0.152 | –4.6 (–6.6 to –2.7) | <0.001 | 0.313 | 80.2% | 80.6% |
| January to March | –2.2 (–3.7 to –0.6) | 0.006 | –0.188 | –0.9 (–2.5 to 0.7) | 0.285 | –3.5 (–5.3 to –1.6) | <0.001 | 0.305 | 82.8% | 85.0% |
| April to May | –2.5 (–4.3 to –0.7) | 0.007 | –0.189 | –1.1 (–3.1 to 0.8) | 0.250 | –3.8 (–6.0 to –1.6) | 0.001 | 0.299 | 85.9% | 88.4% |
| Team match availability | ||||||||||
| Whole season | –1.8 (–3.1 to –0.5) | 0.007 | –0.186 | –0.2 (–1.5 to 1.1) | 0.758 | –4.3 (–5.8 to –2.8) | <0.001 | 0.402 | 86.0% | 87.8% |
| August to December | –1.1 (–2.6 to 0.4) | 0.156 | –0.098 | 0.6 (–1.0 to 2.1) | 0.475 | –4.5 (–6.3 to –2.7) | <0.001 | 0.341 | 85.9% | 87.0% |
| January to March | –2.9 (–4.4 to –1.4) | <0.001 | –0.250 | –1.4 (–3.0 to 0.2) | 0.090 | –4.2 (–6.0 to –2.3) | <0.001 | 0.380 | 85.4% | 88.3% |
| April to May | –2.7 (–4.5 to –0.9) | 0.003 | –0.204 | –1.2 (–3.1 to 0.7) | 0.217 | –4.2 (–6.4 to –2.0) | <0.001 | 0.326 | 86.1% | 88.8% |