Table 1.

Demographics

Stage	Gender	Race	Sport/act	Age sport began (y)	Years of play	Age at onset of symptoms (y)	Interval between retirement and symptoms (y)	Interval between symptom onset and death (y)	Age at death (decade)
II	M	C	Football	16	15	65	34	5	7
	M	AA	Football	11	10	45	24	8	5
	M	C	Football	9	20	28	−1	2	3
	M	C	Semi-pro. football	8	18	30	4	32	6
	M	C	College football	6	15	21	0	4	2
	M	C	HS football, Wrestling, Pole vaulting	6	11	20	2.5	5	2
Mean ± SD				9.3 ± 3.7	14.8 ± 3.8	34.8 ± 17.2	10.5 ± 14.7	9.3 ± 11.2	4.1 ± 2.1
III	M	AA	Football	10	17	28	1	28	5
	M	C	Football	11	23	35	1	11	4
	M	C	Football	14	17	35	4	32	6
	M	C	Football	10	21	40	9	5	4
	M	C	Football	14	15	24	−5	36	6
Mean ± SD				11.8 ± 2.0	18.6 ± 3.2	32.4 ± 6.3	2.0 ± 5.0	22.4 ± 13.6	5.0 ± 1.0
IV	M	AA	Boxing	12	19	30	−1	43	7
	M	C	Football	10	30	57	17	22	7
	M	C	Football	16	13	68	39	11	7
	M	AA	Football	9	22	50	19	12	6
	M	AA	Football/Veteran	14	23	65	28	15	8
	M	C	Football/Veteran	15	15	32	2	45	7
Mean ± SD				12.6 ± 2.8	20.3 ± 6.1	50.3 ± 16.2	17.3 ± 15.2	24.6 ± 15.4	7.0 ± 0.6

AA, African American; C, Caucasian; HS, high school; M, male; Semi-pro, semiprofessional.