Table 7.

Regression Coefficients (β) and Standard Errors (SE) of the Novel P3 of Twin A from the Main Effects as well as Two- and Three-Way Interactions of the Hierarchical Multiple Regression Analyses with “Maximum Number of Drinks Consumed in a 24-hour Period” (MAX-D24) at Age 25, With and Without Smoking as Covariate

	Latency		Frontal amp.		Central amp.		Parietal amp.
	β	SE	β	SE	β	SE	β	SE
With smoking
P3twin B			0.27***	0.06	0.36***	0.07	0.37***	0.08
Zygosity
Gender					2.84*	1.44
Smoking			−3.45***	0.99	−4.18***	1.15	−3.91***	1.14
MAX-D24
Zygosity × MAX-D24
Zygosity × P3twin B	0.34§	0.19					0.36*	0.16
P3twin B × MAX-D24			−0.32§	0.17
Zygosity × P3twin B × MAX-D24
Without smoking
P3twin B			0.27***	0.07	0.36***	0.07	0.38***	0.08
Zygosity
Gender					3.08*	1.50
MAX-D24
Zygosity × MAX-D24
Zygosity × P3twin B	−0.34§	0.19					−0.43**	0.17
P3twin B × MAX-D24			−0.43*	0.17			−0.32§	0.19
Zygosity × P3twin B × MAX-D24

Only statistically significant, and trend-level, results are shown. N = 147 pairs.

^*p < 0.05,

^**p < 0.01,

^***p < 0.001,

^§p < 0.10.