Epidemiology of sports-related concussion in seven US high school and collegiate sports

Table 4 Incidence of concussion in men’s and women’s lacrosse

	No. (%) of concussions	Injury risk (incidence proportion) per season^a				Injury rate (incidence rate) per 100,000 athlete-exposures
	No. (%) of concussions	Athlete-seasons	Risk (%)^a	95 %CI	CLR	Athlete-exposures	Rate	95 %CI	CLR
Men’s Lacrosse	16 (100)	1246	1.3	0.7, 1.9	1.7	70,341	22.8	11.6, 33.9	2.9
Exposure type^b
Games	10 (62.5)	––	––	––	––	17,801	56.2	21.4, 91.0	4.3
Practices	4 (25)	––	––	––	––	52,540	7.6	0.2, 15.1	99
Setting
High school (n = 41)	14 (87.5)	1033	1.4	0.7, 2.1	3.2	57,054	24.5	11.7, 37.4	3.2
College (n = 3)	2 (12.5)	213	0.9	0.3, 2.2	7.3	13,287	15.1	0.0, 35.9	––
Position
Goaltender	0 (0)	95	0.0	––	––	5366	0.0	––	––
Defense	5 (31.3)	361	1.7	0.4, 3.0	8.8	20,453	29.3	5.9, 52.8	9.0
Midfield	5 (31.3)	299	1.7	0.2, 3.1	5.0	16,986	29.4	3.6, 55.2	15.2
Attack	6 (37.5)	471	1.1	0.1, 2.0	14.2	26,420	18.9	2.3, 35.5	15.2
Women’s Lacrosse	26 (100)	1713	1.5	0.9, 2.1	2.2	111,195	23.4	14.4, 32.4	2.3
Exposure type^b
Games	22 (84.6)	––	––	––	––	26,448	83.2	48.4, 117.9	2.4
Practices	3 (11.5)	––	––	––	––	84,747	3.5	0.0, 7.6	---
Setting
High school (n = 26)	21 (80.8)	1562	1.3	0.8, 1.9	2.5	100,098	21.0	12.0, 30.0	2.5
College (n = 3)	5 (19.2)	151	3.3	0.5, 6.2	13.4	11,097	45.1	5.6, 84.6	15.2
Position^c
Goaltender	0 (0)	103	0.0	––	––	6737	0.0	––	––
Defense	7 (26.9)	407	1.7	0.5, 3.0	6.5	26,361	26.6	6.9, 46.2	6.7
Midfield	9 (34.6)	741	1.2	0.4, 2.0	4.7	48,140	18.7	6.5, 30.9	4.8
Attack	9 (34.6)	440	2.1	0.7, 3.4	4.7	28,539	31.5	10.9, 52.1	4.8

CI confidence interval, CLR confidence limit ratio
^aInjury risk is the average probability that an athlete will be concussed during a season
^bData was missing on type of exposure (game or practice) for two concussions (13 %) for men’s lacrosse
^cThere was one concussion (4 %) in activities other than games and practices for women’s lacrosse; position was undefined for this injury

ISSN: 2197-1714