Table 4.

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.