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. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: Neurobiol Aging. 2008 Jul 7;31(5):787–795. doi: 10.1016/j.neurobiolaging.2008.05.021

Table 1.

Basic Demographic Information by Genotype

	ε2+	ε3/3	ε4+
	n = 24	n = 90	n = 33	p
Allele Frequency	0.163	0.612	0.224	n/a
Age at Exam^a	13.54 (1.08)	13.28 (1.30)	13.34 (1.32)	.665^b
Male/Female	13/11	35/55	15/18	.382^c
Ethnicity				.185^c
Asian	1	8	1
African American	2	2	5
Caucasian	17	60	20
Filipino	2	4	0
Hispanic	2	14	7
Other	0	2	0
Handedness (R/L)	17/7	82/8	31/2	.012*^c
Parent Education in Years^a
Mother^d	16.65 (1.93)	16.28 (2.15)	16.46 (2.17)	.769^b
Father^e	16.75 (2.34)	16.07 (2.44)	16.21 (2.60)	.559^b

^a

Data are presented as mean (standard deviation).

^b

One-way ANOVA used to test group differences.

^c

Chi-square used to test group differences.

^d

Based on n = 113.

^e

Based on n = 112.