Table 1.

Demographic characteristics

		Group I Further ACL injury (n = 94)	Group II Control group No further ACL injury (n = 94)	p value
Age at first anterior cruciate ligament injury (year)	Number of subjects	94	94	0.617*
	Mean ± SD	24.5 ± 8.3	25.1 ± 7.5
	Min–Max	13.5–48.7	14.2–46.8
Gender	Male	71	67	0.621†
		75.5%	71.3%
	Female	23	27
		24.5%	28.7%
No further injury Follow-up (year)	Number of subjects	NA	94	NA
	Mean ± SD		6.4 ± 2.2
	Min–Max		2–11
Time to further anterior cruciate ligament injury (month)	Number of subjects	94	NA	NA
	Mean ± SD	30.7 ± 23.6
	Min–Max	3–101

*p value was calculated using one-way ANOVA

^†p value was calculated using Chi-square test or Fisher exact test

ACL anterior cruciate ligament