TABLE 1.
Incidence of Game-Related High School Football Injuries Between Artificial Turf Infill Systems by Infill Weighta
| Infill Weight | |||||
|---|---|---|---|---|---|
| Variable | ≥9.0 lb/ft2 | 6.0-8.9 lb/ft2 | 3.0-5.9 lb/ft2 | 0.0-2.9 lb/ft2 | Total/Mean |
| Games evaluated, n (%) | 528 (28.8) | 521 (28.4) | 525 (28.6) | 263 (14.2) | 1837 (100.0) |
| All injuries | |||||
| n (%) | 917 (19.7) | 1324 (28.4) | 1590 (34.2) | 824 (17.7) | 4655 (100.0) |
| IIR (95% CI) | 17.4 (16.9-17.7)b,f,h | 25.4 (24.8-25.8)c,d | 30.3 (29.9-30.5)e,g | 31.3 (30.7-31.8)e,i | 25.3 |
| Minor injuries | |||||
| n (%) | 666 (72.6) | 884 (66.8) | 1054 (66.3) | 488 (59.2) | 3092 (66.4) |
| IIR (95% CI) | 12.6 (12.2-13.0)f,h | 17.0 (16.5-17.3)b,g | 20.1 (19.8-20.2)c,i | 18.6 (18.0-18.9)c,i | 16.8 |
| Substantial injuries | |||||
| n (%) | 168 (18.3) | 322 (24.3) | 405 (25.5) | 263 (31.9) | 1158 (24.9) |
| IIR (95% CI) | 3.2 (2.8-3.6)f,h | 6.2 (5.8-6.6)b,g | 7.7 (7.3-8.1)c,i | 10.0 (9.9-10.0)c,i | 6.3 |
| Severe injuries | |||||
| n (%) | 83 (9.1) | 118 (8.9) | 131 (8.2) | 73 (8.9) | 405 (8.7) |
| IIR (95% CI) | 1.6 (1.3-1.9)b | 2.3 (1.9-2.6)b | 2.5 (2.1-2.9)c | 2.8 (2.3-3.3)c | 2.2 |
aWilks λ severity of injury (F 2,4648 = 5.087; P = .0001). IIR, injury incidence rate (calculated as [number of injuries/number of team games] × 10). Minor injury, 0-6 days of injury time loss; substantial injury, 7-21 days of injury time loss; severe injury, ≥22 days of injury time loss.
Statistically significant at b,cP < .05, d,eP < .01, f,gP < .001, h,iP < .0001.