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. Author manuscript; available in PMC: 2013 Jul 17.

Published in final edited form as: Psychophysiology. 2009 Feb 17;46(3):458–465. doi: 10.1111/j.1469-8986.2009.00793.x

Table 1.

General Characteristics of Study Subjects by Ethnicity and Gender

	EA^a		AA^b		P value
Characteristics	Male	Female	Male	Female	Ethnicity	Gender
n	210	217	126	182
Age (years)	17.3 ± 4.0	18.4 ± 3.8	17.6 ± 3.6	18.0 ± 3.8	n.s.	n.s.
Height (cm)^c	171.9 ± 10.5	161.8 ± 7.4	173.0 ± 8.5	162.2 ± 6.4	n.s.	<.001
Weight (kg)^c	68.9 ± 20.8	62.0 ± 17.5	72.8 ± 22.2	69.5 ± 21.0	<.001	<.001
BMI (kg/m²)^c	23.1 ± 5.7	23.5 ± 5.7	24.1 ±6.1	26.4 ± 7.5	<.001	.027

Data are mean ± SD. EA: European Americans, AA: African Americans, and BMI: body mass index.

^a

Including 91 monozygotic (MZ) and 102 dizygotic (DZ) pairs as well as 41 singletons.

^b

Including 50 MZ and 84 DZ pairs as well as 40 singletons.

^c

Age was adjusted for the evaluation of ethnic and gender effects.