Table 2.

Demographics of the DDI cohorts per clinical diagnostic group.

	Cognitively unimpaired		Cognitively impaired
	Aβ−	Aβ+	Aβ−	Aβ+
# Subjects (male vs. female)	113/137	32/53	83/73	74/74
# Visits	333	108	222	191
APOE allele (ε−/ε+ ratio)	1.94	0.64	2.32	0.42
Age (years)	62.30 ± 9.53	68.21 ± 7.10	65.38 ± 9.06	70.47 ± 7.93
Education (years)	13.95 ± 2.88	14.18 ± 3.13	13.68 ± 3.31	13.23 ± 3.50
MMSE score	28.78 ± 1.76	28.73 ± 1.55	28.62 ± 1.73	27.49 ± 2.72