TABLE A1.
Frequency and Rate of Game-Related High School Football Injuries Between Artificial Turf Infill Systems by Stage of Trauma and Type of Tissue Injureda
| Infill Weight | ||||||||
|---|---|---|---|---|---|---|---|---|
| ≥9.0 lb/ft2
(n = 528) |
6.0-8.9 lb/ft2
(n = 521) |
3.0-5.9 lb/ft2
(n = 525) |
0.0-2.9 lb/ft2
(n = 263) |
|||||
| Variable | n | IIR (95% CI) | n | IIR (95% CI) | n | IIR (95% CI) | n | IIR (95% CI) |
| Stage of injury | ||||||||
| Acute injury—no prior history | 796 | 15.1 (14.6-15.5)d,f | 1198 | 23.0 (22.4-23.4)b,e | 1368 | 26.1 (25.4-26.5)c,g | 754 | 28.7 (28.0-29.0)c,g |
| Acute injury—recurrent history | 121 | 2.3 (2.0-2.7)b | 126 | 2.4 (2.1-2.8)b | 222 | 4.2 (3.8-4.7)c | 70 | 2.7 (2.2-3.2)b |
| Type of tissue injured | ||||||||
| Bone | 54 | 1.0 (0.8-1.3) | 65 | 1.2 (1.0-1.6) | 53 | 1.0 (0.8-1.3) | 41 | 1.6 (1.2-2.0) |
| Joint | 393 | 7.4 (7.1-7.8)b,d | 566 | 10.9 (10.6-11.1)c | 609 | 11.6 (11.2-11.9)c | 331 | 12.6 (12.0-13.1)e |
| Muscle | 333 | 6.3 (5.9-6.7)h | 565 | 10.8 (10.5-11.1)i | 715 | 13.6 (13.1-14.0)i | 384 | 14.6 (13.9-15.2)i |
| Neural | 101 | 1.9 (1.6-2.3) | 95 | 1.8 (1.5-2.2) | 118 | 2.2 (1.9-2.6) | 53 | 2.0 (1.6-2.5) |
| Other | 36 | 0.7 (0.5-0.9)d | 33 | 0.6 (0.5-0.9)d | 95 | 1.8 (1.5-2.2)e | 15 | 0.6 (0.3-0.9)d |
aWilks λ stage of injury (F 2,4650 = 6.585; P = .0001); type of tissue injured (F 4,4647 = 5.160; P = .0001). IIR, injury incidence rate (calculated as [number of injuries/number of team games] × 10).
Statistically significant at b,cP < .05, d,eP < .01, f,gP < .001, h,iP < .0001.