Table 1.

Demographics of the ADNI cohorts per clinical diagnostic group.

	Cognitively unimpaired		Cognitively impaired
	Aβ−	Aβ+	Aβ−	Aβ+
# Subjects (male vs. female)	186/202	96/147	184/137	254/218
# Visits	795	423	576	717
APOE allele (ε−/ε+ ratio)	3.97	1.23	3.94	0.62
Age (years)	74.61 ± 7.26	77.15 ± 7.00	73.16 ± 8.65	75.38 ± 7.39
Education (years)	16.74 ± 2.50	16.42 ± 2.61	16.25 ± 2.66	16.03 ± 2.74
MMSE score	29.08 ± 1.20	28.80 ± 1.38	28.23 ± 1.98	26.84 ± 2.63