Age group | Exposure | All contacts | Contacts on play | Head contact | |||||||||
Games | Plays | Plays | Contacts | IR per 1000 AP | IR per 100 PH | 1 | 2 | 3 | Plays | Contacts | IR per 1000 AP | IR per 100 PH | |
12U | 4 | 126 | 16 | 27 | 15.3 | 145 | 7 | 7 | 2 | 4 | 4 | 2.3 | 21.4 |
14U | 6 | 198 | 34 | 63 | 22.7 | 225 | 8 | 23 | 3 | 9 | 9 | 3.3 | 32.1 |
HS | 38 | 1318 | 202 | 366 | 19.8 | 165 | 72 | 96 | 34 | 66 | 67 | 3.6 | 30.2 |
All | 48 | 1643 | 252 | 456 | 19.8 | 170 | 87 | 126 | 39 | 79 | 80 | 3.5 | 29.8 |
AP, athlete-plays; HS, high school; IR, incidence rate; PH, player-hours (computed assuming 20 min games for 12U and 14U and 25 min games for HS); 12U, under 12; 14U, under 14.