Table 1.

Demographics and Cognitive Screening, Episodic Memory, and Paced Finger-Tapping Performances by Group

	ε4− (n = 65)		ε4+ (n = 41)		MCI^ (n = 24)		F	p	ηp2	(p’s < .05)
	Mean	SD	Mean	SD	Mean	SD
Demographics
Age (years)	73.3	5.1	72.2	4.9	75.5	6.6	3.01	.053	.045
Education (years)	14.5	2.4	15.6	2.8	14.4	2.7	2.56	.081	.039
Sex (male/female)	19/46		14/27		6/18		0.64a	.726	.070b
Cognitive Screening
MMSE ( /30)	29.3	0.8	29.1	1.1	27.3	2.1	22.66c	<.001	.263	MCI < ε4−, ε4+
DRS-2
Attention ( /37)	36.5	0.7	36.4	0.8	35.6	1.5	7.84	.001	.110	MCI < ε4−
Initiation/Perseveration ( /37)	36.8	0.5	36.5	1.8	34.3	2.7	20.44c	<.001	.243	MCI < ε4−, ε4+
Construction ( /6)	5.9	0.2	6.0	0.2	5.8	0.4	3.97	.021	.059	ns
Conceptualization ( /39)	37.2	2.5	37.3	1.8	36.1	2.3	1.36d	.261	.021
Memory ( /25)	24.1	1.1	24.1	1.4	19.4	4.1	50.82	<.001	.445	MCI < ε4−, ε4+
Total ( /144)	140.5	2.9	140.0	3.7	131.2	7.0	42.70d	<.001	.402	MCI < ε4−, ε4+
Episodic Memory
RAVLT
Trials 1–5 ( /75)	48.6	8.8	46.2	8.8	29.8	7.7	38.24c	<.001	.376	MCI < ε4−, ε4+
Immediate Recall ( /15)	9.8	2.6	8.4	2.5	4.1	2.5	39.65c	<.001	.384	MCI < ε4−, ε4+; ε4+ < ε4−
Delayed Recall ( /15)	9.8	2.7	8.7	3.0	3.0	1.9	52.06c	<.001	.451	MCI < ε4−, ε4+; ε4+ < ε4−
Paced Finger-Tapping (ms)
M-ITI (meanx − target)	−21	66	−35	52	−71	88	0.93e	.399	.014
SD-ITI	55	31	53	30	82	48	3.66ce	.029	.054	MCI > ε4−, ε4+*

Note. ε4 = apolipoprotein E-epsilon 4; MCI = mild cognitive impairment; MMSE = Mini-Mental State Examination; DRS-2 = Dementia Rating Scale-2^nd Edition; RAVLT = Rey Auditory Verbal Learning Test; ms = milliseconds; ITI = inter-tap interval.

^{^}9 ε4−, 15 ε4+.

^aPearson Chi-Square Test.

^bCramer’s V.

^cANOVA results using standardized residual scores based on regression with age as a predictor.

^dANOVA results using standardized residual scores based on regression with age and education as predictors.

^eReciprocal square root data transformation.

^*p < .10.