TABLE 3.

First-Time Noncontact ACL Injury Rate Estimates Based on Poisson Regression Results and Corrected Exposure-Days^a

	ACL Injuries		Person-Days of Exposure		Estimated Injury Rate per 1000 Person-Days of Exposure
Sport	Observed	Estimated	Originalb	Correctedc	Original	95% CI	Corrected	95% CI
Male college
Soccer	6	4.4	30,241	23,747	0.146	0.087–0.245	0.186	0.111–0.312
Basketball	2	2.7	38,927	30,568	0.070	0.038–0.127	0.089	0.049–0.161
Lacrosse	6	5.9	71,731	56,328	0.083	0.050–0.138	0.105	0.063–0.176
Football	3	2.6	18,417	14,462	0.139	0.071–0.273	0.177	0.090–0.348
Rugby	3	3.3	17,886	14,045	0.185	0.091–0.376	0.235	0.115–0.479
Female college
Soccer	11	8.6	28,115	22,078	0.307	0.195–0.482	0.391	0.249–0.614
Basketball	5	5.1	34,882	27,392	0.146	0.084–0.253	0.186	0.108–0.322
Lacrosse	4	6.5	37,567	29,500	0.174	0.106–0.285	0.221	0.135–0.363
Field hockey	1	2.1	25,993	20,411	0.082	0.033–0.204	0.105	0.042–0.260
Rugby	6	5.7	14,723	11,561	0.387	0.197–0.759	0.493	0.251–0.967
Volleyball	1	1.0	2237	1757	0.447	0.063–3.173	0.569	0.080–4.041
Male high school
Soccer	3	7.2	117,140	91,986	0.062	0.038–0.099	0.078	0.049–0.126
Basketball	4	3.2	108,622	85,297	0.029	0.016–0.053	0.037	0.021–0.067
Lacrosse	7	4.2	121,583	95,475	0.035	0.020–0.594	0.044	0.026–0.076
Football	8	8.4	144,233	113,261	0.059	0.032–0.106	0.075	0.041–0.136
Female high school
Soccer	15	14.7	114,077	89,580	0.129	0.087–0.192	0.164	0.111–0.244
Basketball	6	6.0	98,296	77,188	0.061	0.036–0.105	0.078	0.046–0.133
Lacrosse	6	6.3	86,160	67,658	0.073	0.044–0.121	0.093	0.056–0.154
Field hockey	4	2.9	82,946	65,134	0.035	0.014–0.095	0.044	0.018–0.108

^aACL, anterior cruciate ligament.

^bRetrospectively calculated by multiplying the number of athletes on each team by the number of games and practices.

^cExposure days calculated as follows: corrected = 0.785 × original person-days.