Table 2.
Anterior Cruciate Ligament Injury IRs and IRRs Based on NCAA Division, Given Both Type of Athletic Exposure (Match vs Practice) and Playing Surfacea
| Natural Grass IR per 10,000 AEs | Artificial Turf IR per 10,000 AEs | IRR (95% CI) | P | |
|---|---|---|---|---|
| Division I | ||||
| Match | 2.50 | 2.87 | 0.87 (0.67-1.13) | .27 |
| Practice | 0.93 | 0.12 | 7.69 (4.55-14.17) | <.0001 |
| Division II | ||||
| Match | 4.71 | 2.56 | 1.85 (1.45-2.38) | <.0001 |
| Practice | 0.33 | 0 | NA | NA |
| Division III | ||||
| Match | 2.78 | 3.97 | 0.70 (0.61-0.80) | <.0001 |
| Practice | 0.28 | 0.05 | 5.28 (3.03-10.05) | <.0001 |
aAE, athletic exposure; IR, incidence rate; IRR, incidence rate ratio; NA, not applicable; NCAA, National Collegiate Athletic Association.