2010 | 2011 | 2010 vs 2011 | |||
---|---|---|---|---|---|
Incidents | Rate | Incidents | Rate | Rate ratio | |
All head incidents (n=410) | |||||
Head-to-head | 74 | 9.3 (7.2 to 11.5) | 70 | 8.8 (6.8 to 10.9) | 0.95 (0.68 to 1.31) |
Arm-to-head | 109 | 13.8 (11.2 to 16.3) | 79 | 10.0 (7.8 to 12.2) | 0.72 (0.54 to 0.97) |
Shoulder-to-head | 10 | 1.3 (0.5 to 2.0) | 11 | 1.43 (0.65 to 2.2) | 1.10 (0.47 to 2.59) |
Trunk-to-head | 10 | 1.3 (0.5 to 2.0) | 7 | 0.9 (0.2 to 1.5) | 0.70 (0.27 to 1.84) |
Leg-to-head | 21 | 2.7 (1.5 to 3.8) | 16 | 2.0 (1.0 to 3.0) | 0.76 (0.40 to 1.46) |
Otder-head | 2 | – | 1 | – | – |
Heading duel (n=286) | |||||
Head-to-head | 68 | 8.6 (6.5 to 10.6) | 66 | 8.3 (6.5 to 10.3) | 0.97 (0.69 to 1.36) |
Arm-to-head | 84 | 10.6 (8.3 to 12.9) | 47 | 5.9 (4.2 to 7.6) | 0.56 (0.39 to 0.80) |
Shoulder-to-head | 6 | 0.8 (0.2 to 1.4) | 3 | 0.4 (0.0 to 0.8) | 0.50 (0.13 to 2.00) |
Trunk-to-head | 2 | 0.3 (−0.1 to 0.6) | 4 | 0.5 (0.0 to 1.0) | 2.00 (0.37 to 10) |
Leg-to-head | 3 | 0.4 (0.0 to 0.8) | 2 | 0.3 (−0.1 to 0.6) | 0.67 (0.11 to 4.00) |
Otder-head | 0 | – | 1 | – | – |
Rate is reported per 1000 player-match hours with 95% CI. Rate ratios between the 2010 and 2011 seasons are shown with 95% CI, with the 2010 season as the reference group.