Table 1.

Sample characteristics of 5,117 participants from a biracial population sample

	All Participants Mean (SD)	African Americans Mean (SD)	European Americans Mean (SD)	p
	N = 5,117	N = 3,363	N = 1,754
Age, y	71.4 (5.4)	70.6 (4.8)	72.8 (6.1)	<0.001
Education, y	12.5 (3.6)	11.6 (2.6)	14.2 (3.2)	<0.001
Global cognition	0.346 (0.653)	0.182 (0.669)	0.659 (0.486)	<0.001
Years of follow-up	9.9 (3.5)	9.9 (3.4)	10.0 (3.6)	0.83
Females, %	3,233, 63%	2,129, 63%	1,105, 63%	0.77
APOE ε4 allele, %	1,269, 33%	898, 37%	371, 26%	<0.001