TABLE 1.

Distribution of Concussions by Year, Age Group, and Sex

	Patients Diagnosed With Concussion, n	Concussion Incidence per 1000 Patients	P Valuea
Year			<.001
2007	3529	1.4
2008	4038	1.6
2009	4798	2.1
2010	4740	2.1
2011	5149	2.2
2012	6477	2.5
2013	6936	2.5
2014	8217	2.3
Age group, y			<.001
<5	1322	1.7
5-9	1855	3.5
10-14	5425	10.5
15-19	8499	16.5
20-24	3061	5.2
25-29	2046	2.7
30-34	1973	2.5
35-39	2167	2.5
40-44	2588	2.6
45-49	2997	2.6
50-54	3671	2.8
55-59	4088	3
60-64	4192	3.1
Sex			<.001
Female	19,818	6.6
Male	24,066	9.4

^aChi-square analysis was used to determine statistical significance for each group.