Intrinsic factors |
Age group | | | | 0.01 |
13–15 | 2264 | 1.00 | | |
16–17 | 1088 | 1.68 | (1.22 to 2.30) | |
18–20 | 683 | 1.10 | (0.66 to 1.83) | |
21–24 | 606 | 1.65 | (0.97 to 2.80) | |
25–34 | 951 | 1.52 | (0.91 to 2.54) | |
35+ | 438 | 1.31 | (0.68 to 2.50) | |
Ethnicity | | | | 0.08 |
Maori | 1382 | 1.00 | | |
Pacific Island | 390 | 1.48 | (1.03 to 2.13) | |
Other | 4258 | 1.03 | (0.81 to 1.31) | |
Strenuous physical activity (hours per week) | | | | 0.01 |
0–39 | 5666 | 1.00 | | |
40+ | 364 | 1.54 | (1.11 to 2.15) | |
Playing while injured | | | | <0.01 |
No | 3141 | 1.00 | | |
Yes | 2889 | 1.46 | (1.20 to 1.79) | |
Extrinsic factors |
Grade played | | | | 0.11 |
Under 14/15/16/17/schoolboy | 2766 | 1.10 | (0.74 to 1.65) | |
Under 18/19 | 530 | 1.00 | | |
Colts | 334 | 0.93 | (0.50 to 1.72) | |
Senior B/reserve | 687 | 1.08 | (0.62 to 1.87) | |
Senior A | 1050 | 1.49 | (0.89 to 2.49) | |
Presidents/social | 395 | 1.92 | (1.00 to 3.68) | |
Other | 268 | 1.07 | (0.57 to 2.01) | |
Ground condition | | | | 0.01 |
Firm | 3312 | 1.00 | | |
Muddy | 2269 | 1.18 | (0.99 to 1.42) | |
Very hard | 449 | 1.50 | (1.13 to 2.00) | |
Foul play | | | | <0.01 |
No | 5152 | 1.00 | | |
Yes | 878 | 1.87 | (1.54 to 2.27) | |
Use of headgear | | | | 0.05 |
Not used | 4223 | 1.00 | | |
Used | 1807 | 1.23 | (1.00 to 1.50) | |