. 2016 Dec 19;25(5):1542–1554. doi: 10.1007/s00167-016-4399-0

Table 3.

Patient sex, age and concomitant injury and risk of revision ACL surgery

	Revision cohort (n = 552)
	%	N	Hazard rate	95% CI	P value
Patient sex
Male^a	53.6	296	1.128	0.954–1.333	n.s.
Female	46.4	256	1.128	0.954–1.333
Age at index ACL reconstruction
13–15 years	13.4	74	5.259	3.532–7.833	<0.001
16–20 years	45.7	252	4.675	3.297–6.628	<0.001
21–25 years	21.2	117	3.131	2.155–4.548	<0.001
26–30 years	7.8	43	1.590	1.021–2.476	0.040
31–35 years	5.4	30	1.527	0.941–2.479	n.s.
36–49 years^a	6.5	36
Meniscus injury present (medial and/or lateral) at index surgery
Yes	43.1	238	0.994	0.840–1.176	n.s.
No^a	56.9	314	0.994	0.840–1.176
Cartilage injury present at index surgery
Yes	21.2	117	0.720	0.587–0.883	0.002
No^a	78.8	435	0.720	0.587–0.883

ACL anterior cruciate ligament, CI confidence interval

^aReference group