Table 3.

Mean (standard deviation) and significance levels for main effects and interactions on memory measures in older, non-demented subjects divided on stress level and APOE-ε4 status.

					p-value
	Groups				Main Effect		Interaction
	High Stress		Low Stress
	ε4-pos	ε4-neg	ε4-pos	ε4-neg	Stress	APOE
WMS-R Logical Memory
Stories A & B - Immediate	19.2 (7.2)	26.2 ∞ (8.2)	26.4 ξ (10.4)	25.6 ‡ (7.5)	.05	ns	.03
Stories A & B - Delay	14.1 (9.3)	21.5 ∞ (9.4)	23.3 ξ (12.7)	21.1 ‡ (8.5)	.04	ns	.02
California Verbal Learning Test
Learning Trials 1-5	40.7 (10.8)	39.5 (11.4)	45.8 (15.6)	43.4 (10.1)	.08	ns	ns
Long Delay Free Recall	7.1 (4.3)	6.9 (3.2)	9.5 ƒ (4.6)	8.6 (3.2)	.02	ns	ns
Recall Intrusion Errors	15.1 (17.4)	5.6 (6.0)	7.9 (9.1)	5.9 (4.9)	ns	<.01	.06
Recognition Discriminability	83.7 (12.7)	90.0 (8.6)	90.4 (12.5)	89.0 (8.2)	ns	ns	.09
Recognition False Positive Errors	4.7 (4.4)	2.0 ∞ (2.5)	2.7 (4.5)	3.2 (3.3)	ns	.06	.04
Wechsler Memory Scale
Visual Reproduction Immediate	9.3 (3.5)	12.2 ∞ (2.9)	11.5 (3.4)	12.5 ‡ (2.8)	.07	<.01	ns
Visual Reproduction Delay	5.6 (4.3)	9.7 ∞ (4.3)	9.1 ξ (4.3)	10.3 ‡ (3.6)	.04	<.01	ns
Dementia Rating Scale
Memory Subscale	22.3 (3.2)	23.9 (1.7)	23.9 (2.3)	24.1 ‡ (.88)	.05	.04	ns

^∞High ε4+ versus High ε4- p≤.05

^‡High ε4+ versus Low ε4- p≤.05

^ξLow ε4+ versus High ε4+ p≤.05

^ƒLow ε4+ versus High ε4- p≤.05

^θLow ε4- versus High ε4- p≤.05

WMS-R = Wechsler Memory Scale - Revised

ε4-pos = ε4-positive

ε4-neg = ε4-negative

ns = non-significant