Table 1a.

Characteristics of the groups expressed as means and standard deviations for Study 1.

	Intact-1	MCI-1	AD	p	Post hoc
	n = 41	n =21	n = 27
Age, years	79.9 ± 10.9	91.6 ± 6.9	79.7 ± 12.9	< .0001	MCI-1 vs. Intact-1, p < .0001 MCI-1 vs. AD, p < .0001
Education, years	16.1 ± 2.2	15.4 ± 2.1	15.7 ± 2.8	0.56	N/A
Sex, % female	56%	43%	59%	0.49	N/A
Race, % white	100%	100%	100%	1.0	N/A
SES	52.5 ± 8.5	49.8 ± 11.1	52.0 ± 10.7	0.58	N/A
MMSE*	29.2 ± 1.0	26.6 ± 2.7	23.3 ± 2.3	< .0001	MCI-1 vs. Intact-1, p < .0001 MCI-1 vs. AD, p < .0001
CERAD Word List acquisition*	22.5 ± 3.6	15.1 ± 3.3	12.8 ± 3.1	< .0001	MCI-1 vs. Intact-1, p < .0001 MCI-1 vs. AD, p = .0071
CERAD Word List delayed recall*	7.8 ± 1.6	3.9 ± 2.0	1.6 ± 1.7	< .0001	MCI-1 vs. Intact-1, p < .0001 MCI-1 vs. AD, p < .0001

⁸Age-adjusted

Note. SES = Socioeconomic status; MMSE = Mini-Mental State Examination; CERAD = Consortium to Establish a Registry for Alzheimer's Disease; Intact-1 = controls for Study 1; MCI-1 = mild cognitive impairment participants for Study 1; AD = Alzheimer's disease; N/A = Not applicable