Table 1.

Participant Characteristic

Characteristic	Entire Group (N = 966)
Age at death (mean ± SD)	87.9 ± 6.7
Gender (% female)	616, 64%
Years of education (mean ± SD)	16.5 ± 3.7
Race (number white, % white,)	938 (97%)
APOE ε4 allele present, (number, %,)	249/939, 27%
National Adult Reading Test (mean ± SD)	12.9 ± 3.8
Early life socioeconomic status* (mean ± SD)	−0.007 ± 0.7
Cognition status at death (n = 964)
Normal cognition, %	308, 32%
MCI (single & multiple domain), %	242, 25%
Dementia, %	414, 43%
Medical comorbities at enrollment in study
Hypertension (n, %)	N/962, 59%
Stroke (n, %)	N/960 24%
Head injury (n, %)	N/ 964 9%
Thyroid disease (n, %)	N/965, 23%
Heart condition (n, %)	N/965, 24%
Cancer (n, %)	N/965, 42%

APOE = Apolipoprotein E; SES = socioeconomic status; MCI = mild cognitive impairment. SD = standard deviation

^*Early life SES indicates a composite index, with higher scores indicating higher SES.