Table 2.

Gender, age and concomitant injury and risk of contralateral ACL reconstruction

	Contralateral ACL reconstruction cohort (n = 526)
	%	N	Hazard rate	95% CI	P value
Gender
Malea	49.4	260	1.337	1.127–1.586	0.001
Female	50.6	266
Age at index ACL reconstruction (years)
13–15	16.7	88	2.771	1.456–5.272	0.002
16–20	43.7	230	1.230	0.689–2.197	n.s.
21–25	16.7	88	0.752	0.394–1.441	n.s.
26–30	8.2	43	0.491	0.229–1.054	n.s.
31–35	6.1	32	0.532	0.232–1.220	n.s.
36–49a	8.6	45
Meniscus injury present (medial and/or lateral) at index surgery
Yes	45.1	237	1.086	0.914–1.289	n.s.
Noa	54.9	289
Cartilage injury present at index surgery
Yes	22.4	118	0.765	0.623–0.939	0.010
Noa	77.6	408

ACL anterior cruciate ligament, CI confidence interval

^aReference group