. Author manuscript; available in PMC: 2012 Jan 24.

Published in final edited form as: J Polit. 2010;72(4):1189–1198. doi: 10.1017/S0022381610000617

Table A6.

Quantitative Disequilibrium Transmission Test of an Association Between DRD4 and Political Ideology, Including an Interaction with Number of Male Friendships

	Estimate (standard error)	p-value
Intercept	2.77 (0.24)	0.00
Between-family component of DRD4-7R (b)	-0.05 (0.04)	0.13
Within-family component of DRD4-7R (w)	-0.07 (0.11)	0.53
Male Friendships	0.02 (0.01)	0.11
Age	0.01 (0.01)	0.54
Male	-0.06 (0.04)	0.09
wMale Friendships*	0.09 (0.04)	0.04
Deviance	1116.97
N	1941

Note: This table can be read like an ordinary regression except that the variable coding for DRD4 is divided into two variables to control for population stratification. The between-family component represents the average number of DRD4-7R alleles among all observed members of the subject’s family, while the within-family component indicates the excess number of DRD4-7R alleles relative to the family average. The results show that the interaction term remains positive and significant when we restrict the analysis to male friendships. Null deviance = 1123.28.