Table 1.

Repeat concussions in National Football League players: 1996-2007, 1996-2001, 2002-2007.

	Players				Concussions
	n	%			n	%
Concussions, n	1996-2007				1996-2007
1	847	70.6			847	48.7
2	227	18.9			454	26.1
3	85	7.1			255	14.6
4	29	2.4			116	6.7
5	6	0.5			30	1.7
6	3	0.3			18	1.0
7	3	0.3			21	1.2
Total	1200	100			1741	100
	1996-2001		2002-2007		1996-2001		2002-2007
1	489	75.3	486	75.8	489	55.1	486	56.9
2	108	16.6	111	17.3	216	24.4	222	26.0
3	37	5.7	33	5.1	111	12.5	99	11.6
4	8	1.2	8	1.2	32	3.6	32	3.7
5	4	0.6	3	0.5	20	2.3	15	1.8
6	2	0.3	0	0.0	12	1.4	0	0.0
7	1	0.2	0	0.0	7	0.8	0	0.0
Total	649	100	641	100	887	100	854	100