. Author manuscript; available in PMC: 2016 Mar 1.

Published in final edited form as: Alzheimers Dement. 2014 Sep 10;11(3):249–257.e1. doi: 10.1016/j.jalz.2014.07.001

Table 1.

Characteristics of the study population at baseline

	Population at risk for dementia (n=2189)
General characteristics
Age, years, mean (standard deviation)	72.16 (7.57)
Women, % (N)	56.28 (1232)
Education, % (N)
No high school degree	12.84 (276)
High school degree	34.74 (747)
Some college	26.65 (573)
College graduate	25.77 (554)
APOE ε4 genotype : ≥ 1 APOE ε4 allele, %	21.51 (465)
Confounders
Hypertension, % (N)	61.17 (1359)
Cardiovascular disease, % (N)	24.17 (529)
Smoking, % (N)	7.59 (166)
Total cholesterol, mg/dL, mean (standard deviation)	201.19 (36.63)
Diabetes, % (N)	15.12 (327)
Plasma Aβ levels
Aβ_1-42 levels (pg/mL)^*	44.0 (37.5–50.8)
Aβ_1-40 levels (pg/mL)^*	163.6 (142.7–185.4)
Aβ_1-42/Aβ_1-40 ratio^*	0.268 (0.234–0.308)

mean (standard deviation) are presented unless otherwise stated

Those variables were log-transformed in the analyses. Thus, the median (interquartile range) is used instead of mean (standard deviation)