Table 5.

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 Malmö-Modified Michigan Alcoholism Screening Test (Mm-MAST) at Age 25

	Latency		Frontal amp.		Central amp.		Parietal amp.
	β	SE	β	SE	β	SE	β	SE
P3twin B			0.26***	0.06	0.35***	0.06	0.38***	0.07
Zygosity
Gender			2.14*	0.99	2.88**	1.15	1.88§	1.12
Smoking			−3.54***	0.98	−4.42***	1.13	−4.40***	1.10
Mm-MAST			5.67	4.59	8.77§	5.29	10.58*	5.19
Zygosity × Mm-MAST	−99.43§	57.47
Zygosity × P3twin B	0.35§	0.19					0.35*	0.15
P3twin B × Mm-MAST
Zygosity × P3twin B × Mm-MAST	3.62**	1.46

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

^*p < 0.05,

^**p < 0.01,

^***p < 0.001,

^§p < 0.10.