Table 5.

Extended Univariate GxE Models for Education and Drinking Frequency

Model	Ref. Model	EP	−2LL	df	AIC	Δ-2LL	Δdf	p
1 Full sex-limited moderation	NA	20	6565.06	2476	1613.06	NA	NA	NA
2 Moderation effects constrained across sex	1	17	6565.47	2479	1607.47	0.41	3	0.938
3 Variance and moderation constrained across sex	2	14	6580.32	2482	1616.33	14.85	3	0.002
4 No Moderation	2	14	6610.79	2482	1646.79	45.32	3	0.000
5 No Moderation on A	2	16	6567.09	2480	1607.09	1.63	1	0.203
6 No Moderation on C	2	16	6583.88	2480	1623.88	18.41	1	0.000
7 No Moderation on E	2	16	6591.05	2480	1631.05	25.58	1	0.000
8 No Moderation on Means	2	13	6587.23	2483	1621.23	21.76	4	0.000

Analyses based on 1254 twin pairs ( MZF = 284, MZM = 179, DZF = 244, DZM = 167, DZO = 380).

Ref model = comparison model number for Δ-2LL test; EP =number of estimated parameters.