Table 1.

Demographic, athletic, medical, and APOE carrier status characteristics in former NFL players

Characteristic	Total Sample (n = 89)
Age, mean (SD) y	55.63 (7.77)
Education, mean (SD) y	16.44 (0.99)
Occupational attainment, n (%)
High	59 (66.3)
Low	30 (33.7)
Racial Identity, n (%)
White	52 (58.4)
Black or African American	37 (41.6)
AFE, mean (SD) y	11.96 (2.52)
Duration of football play, mean (SD) y	18.19 (3.54)
Duration of play in the NFL, mean (SD) y	8.04 (2.79)
CHII, mean (SD)	20,089.58 (6,943.69)
Primary position group, n (%)
Offensive Line	27 (30.3)
Running Back	8 (9.0)
Tight End	5 (5.6)
Offensive Skill	1 (1.1)
Defensive Line	12 (13.5)
Linebacker	19 (21.3)
Defensive Back	17 (19.1)
APOE s4 status, n (%)
23	9 (10.3)
24	2 (2.3)
33	52 (59.8)
34	21 (24.1)
44	3 (3.4)

SD, standard deviation; y, years; AFE, age of first exposure; CHII, cumulative head impact index; APOE, Apolipoprotein E.