Playing position at onset |
Back | 61.5 (52.3 to 70.6) | 58.0 (48.3 to 67.7) | 60.4 (51.1 to 69.7) | 60.0 (54.6 to 65.4) |
Forward | 38.5 (29.4 to 47.7) | 42.0 (32.3 to 51.7) | 39.6 (30.3 to 48.9) | 40.0 (34.6 to 45.4) |
Nature of onset |
Acute | 90.8 (85.4 to 96.2) | 87.0 (80.4 to 93.6) | 94.3 (89.8 to 98.7) | 90.8 (87.6 to 94.0) |
Gradual onset | 9.2 (3.8 to 14.6) | 13.0 (6.4 to 19.6) | 5.7 (1.3 to 10.2) | 9.2 (6.0 to 12.4) |
Cause of onset |
Contact | 72.0 (63.5 to 80.5) | 81.1 (73.2 to 88.9) | 79.4 (71.6 to 87.3) | 77.3 (72.6 to 82.0) |
Non-contact | 27.1 (18.7 to 35.5) | 18.9 (11.1 to 26.8) | 19.6 (11.9 to 27.3) | 22.0 (17.4 to 26.7) |
Other | 0.9 (0 to 2.8) | 0.0 (−) | 1.0 (0 to 2.9) | 0.7 (0 to 1.6) |
Time of onset |
First half | 38.3 (29.1 to 47.5) | 37.4 (27.8 to 46.9) | 40.8 (31.3 to 50.3) | 38.8 (33.4 to 44.3) |
Second half | 61.7 (52.5 to 70.9) | 62.6 (53.1 to 72.2) | 59.2 (49.7 to 68.7) | 61.2 (55.7 to 66.6) |