Table 1.

Discovery and internal validation cohort demographic details.

Clinical groups	n (M/F)	Mean age years [SD]	Mean education years [SD]	% APOE ϵ4
Normal control (NC)
Discovery	53 (18/35)	81.6 [3.6]	15.7 [2.3]	24.6
Internal validation	20 (9/11)	81.4 [3.3]	15.1 [2.5]	20
Converterpre
Discovery	18 (8/10)	80.7 [2.3]	15.3 [3.1]	16.7
Internal validation	10 (4/6)	79.3 [5.5]	14.5 [1.8]	20
Total discovery	71 (26/45)	81.8 [3.0]	15.5 [2.7]	20.7
Total internal validation	30 (13/17)	80.9 [4.4]	14.8 [2.2]	20.0

n, number of subjects; F, female subjects; M, male subjects; SD, standard deviation; % APOE ϵ4, percent having at least a single APOE ϵ4 allele.

Gender, age, education, and APOE ϵ4 status were not significantly different (Chi-square p > 0.05) between discovery and internal validation groups.