Table 4.

Sample Characteristics for Incurred Concussion (Cx)

	Controls		ADHD		LD		ADHD+LD
	No Cx	Cx	No Cx	Cx	No Cx	Cx	No Cx	Cx
Age	19.2 ± 1.4	18.8 ± 1.2	19.4 ± 1.5	19.2 ± 1.3	19.3 ± 1.5	18.9 ± .8	19.5 ± 1.5	19.4 ± 1.3
BMI	24.2 ± 3.6	24.7 ± 3.9	24.6 ± 3.9	25.6 ± 4.4	24.7 ± 4.2	26.9 ± 5.9	25.4 ± 4.8	26.8 ± 5.5
Incurred concussions	28,576	2546	1360	153	385	44	275	48
Female (n = 1148)	10,645	1066	476	50	175	17	115	15
Male (n = 1643)	17,931	1480	884	103	210	27	160	33
Incurred a concussion by history
No history	22,617	1639	912	69	276	19	190	22
Female (n = 720)	8518	687	330	21	127	7	86	5
Male (n = 1029)	14,099	952	582	48	149	12	104	17
History (N = 1042)	5959	907	448	84	109	25	85	26
Female (n = 428)	2127	379	146	29	48	10	29	10
Male (n = 614)	3832	528	302	55	61	15	56	16
Incurred a concussion by category
Contact	1266		99		32		40
Female (n = 415)	368		25		10		12
Male (n = 1022)	898		74		22		28
Limited contact	370		24		9		3
Female (n = 285)	266		13		5		1
Male (n = 121)	104		11		4		2
Non-contact	209		11		2		1
Female (n = 169)	157		9		2		1
Male (n = 54)	52		2		0		0
Non-NCAA	701		19		1		4
Female (n = 279)	275		3		0		1
Male (n = 446)	426		16		1		3

ADHD, attention deficit/hyperactivity disorder; LD, learning disability; BMI, body mass index; NCAA, National Collegiate Athletic Association.