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Table 2 Incidence of concussion in football

From: Epidemiology of sports-related concussion in seven US high school and collegiate sports

  No. (%) of concussions Injury risk (incidence proportion) per seasona Injury rate (incidence rate) per 100,000 athlete-exposures
Athlete-seasons Risk (%)a 95 %CI CLR Athlete-exposures Rate 95 %CI CLR
Overall 239 (100) 8524 2.6 2.3, 3.0 1.3 676,274 35.3 30.9, 39.8 1.3
Exposure type          
 Games 148 (61.9) –– –– –– –– 77,767 190.3 159.7, 221.0 1.4
 Practices 85 (35.6) –– –– –– –– 598,507 14.2 11.2, 17.2 1.5
Setting          
 High school 197 (82.4) 7247 2.6 2.2, 3.0 1.4 566,063 34.8 29.9, 39.7 1.3
 College 42 (17.6) 1277 2.9 2.0, 3.8 1.9 110,212 38.1 26.6, 49.6 1.9
Positionb          
 Defensive back 23 (9.6) 811 2.7 1.6, 3.8 2.4 65,327 35.2 20.8, 49.6 2.4
 Defensive lineman 26 (10.9) 1090 2.3 1.4, 3.2 2.3 87,072 29.9 18.4, 41.3 2.3
 Linebacker 29 (12.1) 909 2.8 1.7, 3.8 2.2 72,539 40.0 25.4, 54.5 2.1
 Offensive lineman 48 (20) 2051 2.2 1.6, 2.9 1.8 161,901 29.7 21.3, 38.0 1.8
 Quarterback 19 (7.9) 506 3.6 1.9, 5.2 2.7 39,737 47.8 26.3, 69.3 2.6
 Receiver 31 (13) 1264 2.4 1.5, 3.2 2.1 100,046 31.0 20.1, 41.9 2.1
 Running back 40 (16.7) 1135 3.3 2.2, 4.3 2.0 89,028 44.9 31.0, 58.9 1.9
 Special teams and kicker 5 (2.1) 230 2.2 0.3, 4.1 13.7 18,826 26.6 3.3, 49.8 15.2
 Tight end 13 (5.4) 487 2.7 1.2, 4.1 3.4 38,488 33.8 15.4, 52.1 3.4
  1. CI confidence interval, CLR confidence limit ratio
  2. aInjury risk is the average probability that an athlete will be concussed during a season
  3. bThere were six concussions (2 %) in activities other than games and practices; position is undefined for these injuries