Table 1. Demographic characteristics of the subjects.

	ε4- (n=58)	ε4+ (n=28)
Age (SD), years	70.8 (6.8)	69.1 (4.7)
Education (SD), years	8.9 (5.2)	9.3 (4.7)
Gender (M/F)	22/36	7/21
MMSE score (SD)	26.5 (2.5)	26.4 (2.1)
Neuropsychological test
Animal fluency	16.4 (4.7)	16.2 (4.7)
Boston naming	11.8 (2.2)	11.7 (2.3)
Word list learning	19.2 (4.5)	18.3 (4.1)
Word list recall	7.0 (1.9)	6.7 (1.9)
Word list recognition	9.4 (1.0)	9.3 (0.9)
Constructional praxis	10.3 (1.1)	10.1 (1.3)
Constructional recall	6.7 (2.9)	7.6 (2.6)

Values are given as mean (standard deviation) except for gender ε4- = cognitively normal elderly without apolipoprotein E ε 4 allele; ε4+ =cognitively normal elderly with apolipoprotein E ε 4 allele; MMSE= Mini mental status examination