Table 3. Rate Ratio Based on Rookie vs Nonrookie Season by Body Region.
| Body part or illness | Rate ratio (95% CI)a | |
|---|---|---|
| Rookie season injury | Nonrookie season injury | |
| Ankle | 1.32 (1.12 to 1.52) | 0.76 (0.56 to 0.96) |
| Knee | 0.96 (0.73 to 1.18) | 1.05 (0.82 to 1.27) |
| Illness | 1.14 (0.87 to 1.40) | 0.88 (0.61 to 1.15) |
| Groin, hip, and/or thigh | 0.78 (0.50 to 1.06) | 1.28 (1.00 to 1.56) |
| Trunk, back, and/or buttocks | 0.68 (0.34 to 1.02) | 1.47 (1.12 to 1.81) |
| Foot and/or toe | 1.29 (0.97 to 1.61) | 0.78 (0.46 to 1.09) |
| Forearm, wrist, and/or hand | 0.93 (0.53 to 1.32) | 1.08 (0.68 to 1.47) |
| Shoulder, arm, and/or elbow | 1.43 (1.10 to 1.77) | 0.7 (0.36 to 1.03) |
| Lower leg and/or Achilles tendon | 0.4 (0.00 to 1.03) | 2.48 (1.85 to 3.11) |
| Head and/or neck | 1.21 (0.61 to 1.81) | 0.83 (0.23 to 1.43) |
| Concussion | 2.39 (1.89 to 2.90) | 0.42 (–0.08 to 0.92) |
a
Rate ratio for injury that occurred during the rookie season represents the incidence rate for rookie players divided by incidence rate for veteran player stratified by body part or illness; rate ratio for injury that occurred during nonrookie season represents the incidence rate for veteran players divided by the incidence rate for rookie players stratified by body part or illness.