Table 1.

Demographic data of the AD group and the normal control group

	AD (n = 41)	Control (n = 40)	χ2 or t or U test
Age, years	73.1 ±9.4	63.0± 5.6	p < 0.0001a
Education, years	5.4 ±3.8	10.6± 4.2	p < 0.0001b
Gender, M/F	14/27	13/27	n.s.c
ApoE4 allele frequency	11.25%d	6.4%

Data are presented as mean ± standard deviation unless indicated otherwise. Mean age was higher and mean education lower in the AD group. No gender difference was found between the two groups.

^aUnequal variance t test (with Welch's correction).

^bMann-Whitney U test.

^cComparison between gender distribution of the two groups was done by χ² test (not significant).

^dn = 40, ApoE genotyping not available for one subject in the AD group.