Cox regression analysis for the rate of second ACL injury
| Univariable analysis | Multivariable analysis | |||
| HR (95% CI) | P value | HR (95% CI) | P value | |
| Non-contact versus contact | 7.46 (1.73 to 32.20) | 0.007 | 7.16 (1.63 to 31.22) | 0.009 |
| Isolated versus associated | 3.24 (1.29 to 8.13) | 0.012 | 2.73 (1.06 to 7.07) | 0.037 |
| RTT (per month) | 0.72 (0.51 to 1.03) | 0.080 | 0.87 (0.60 to 1.25) | 0.466 |
| Age (per year) | 1.01 (0.90 to 1.12) | 0.817 | 0.96 (0.83 to 1.07) | 0.520 |
| Right-dominance vs left-dominance | 1.07 (0.38 to 2.95) | 0.893 | _ | |
| Dominant leg vs non-dominant leg | 2.28 (0.76 to 6.85) | 0.139 | _ | |
| PT autograft vs HT autograft | 1.36 (0.52 to 3.52) | 0.526 | _ | |
| PT autograft vs other grafts | 1.26 (0.28 to 5.68) | 0.765 | _ | |
ACL, anterior cruciate ligament; HR, hazard ratio; HT, hamstring tendon; PT, patellar tendon; RTT, return to training.