Table 1.

Racial differences in population characteristics. N (%) is reported unless noted otherwise.

Population characteristics	White (n =168)	Black (n =115)	p--Valueb
Demographic factors
Age (year), mean (SD)	83.2 (2.84)	82.7 (2.68)	0.20
Gender, female	84 (50)	79 (69)	0.001
Psychosocial factors
Health literacy: ≥ 9th grade	150 (94)	72 (67)d	<.001
Education: >high school	101 (60)d	44 (38)	<.001c
Family income: ≥ 25K annual	99 (69)	36 (34)d	<.001c
Cardiometabolic conditions
Diabetesa	35 (20)	41 (35)d	0.005c
Cardiovascular diseasesa	47 (28)d	36 (31)	0.60c
Hypertensiona	134 (80)	98 (86)	0.20
Coronary heart diseasea	38 (22)d	29 (25)	0.60c
Myocardial infarctiona	25 (15)d	20 (17)	0.60c
Strokea	14 (8)	11 (9)	0.70
Body mass index (kg/m2), mean (SD)	26.7 (4.02)d	28.6 (4.77)	<.001
Serum creatinine (mg/dL), median (IQR)	0.98 (0.84, 1.16)d	1.03 (0.87, 1.17)d	0.10c
Lifestyle and other factors
Smoker, ever	77 (46)d	57 (50)d	0.60c
Drinker, current	106 (66)	34 (31)d	<.001c
Physical activity (kcal/kg/week), median (IQR)	2.7 (0.8, 7.4)	1.7 (0.4, 4.8)	0.10
ApoE, presence of allele 4	32 (29)	36 (23)d	0.20c

Abbreviations: IQR=inter--quartile range; SD=standard deviation

^aPrevalence at time of MRI.

^bp--Values were calculated from median test for physical activities and serum creatinine, from student’s t--test for other continuous variables, and from Chi--squared test for categorical variables

^cStatistically significant (p<0.05) differences between males and females in the whole sample.

^dStatistically significant (p<0.05) differences between males and females within each race.