Table 2.

Characteristics of the study participants at baseline (n=4,606)

Variable	Overall sample (n=4,606)	Normal cognition (n=2,240)	MCI (n=1,107)	Dementia (n=1,259)
Age, median (IQR)	70 (65–76)	69 (65–74)	72 (67–78)	71 (63–77)
Female sex, n (%)	2,655 (57.6)	1,456 (65.0)	546 (49.3)	653 (51.9)
Years of education, median (IQR)	16 (14–18)	16 (15–18)	16 (14–18)	16 (13–18)
Ethnicity, n (%)
White	3,675 (79.8)	1,681 (75.0)	881 (79.6)	1,113 (88.4)
African American	624 (13.5)	372 (16.6)	156 (14.1)	96 (7.6)
Others/Unknown	307 (6.7)	187 (8.4)	70 (6.3)	50 (4.0)
MoCA total score, median (IQR)	24 (19–27)	27 (25–28)	23 (20–25)	15 (11–20)

IQR, interquartile range; MCI, mild cognitive impairment; MoCA, Monteral Cognitive Assessment.