Secondary outcome scores with 95% CIs
| Outcome | TennisReady n=286 | Control n=293 | P value |
| Prevalence | |||
| Ankle | 2% (1–4) | 2% (1–4) | 0.68 |
| Knee | 6% (4–8) | 5% (4–8) | 0.88 |
| Shoulder | 4% (3–6) | 5% (3–7) | 0.57 |
| Elbow | 3% (2–6) | 3% (2–5) | 0.78 |
| Substantial injuries | 11% (9–14) | 12% (9–15) | 0.79 |
| Injury incidence* | |||
| Overall | 25.4 (22.5–28.7) | 24.4 (21.8–27.4) | 0.66 |
| Ankle | 1.4 (0.9–2.4) | 1.3 (0.8–2.1) | 0.74 |
| Knee | 3.4 (2.4–4.7) | 3.3 (2.4–4.5) | 0.95 |
| Shoulder | 2.3 (1.5–3.4) | 2.5 (1.7–3.6) | 0.81 |
| Elbow | 1.4 (0.9–2.4) | 2.0 (1.4–3.1) | 0.29 |
| Substantial injuries | 6.7 (5.3–8.5) | 7.2 (5.8–8.9) | 0.71 |
| Time loss per injury (days) | 5.6 (5.4–5.9) | 6.3 (6.0–6.6) | 0.00 |
*Incidence per 1000 hours of tennis exposure.