Table 2a.

Model fit statistics for parent–offspring correlations of the drinking index

	Equal parent–offspring correlation by:		Model-fit indices
Model no.	Female=male	Mother=father	-2lnL	df	X2(df)	p	AIC
Parent–offspring correlation:
1	No	No	31,312.97	16220	–	–	–
2	Yes	No	31,329.89	16230	16.92 (10)	.076	-1,130.11
3	Yes	Yes	31,331.53	16235	18.56 (15)	.234	-1,138.47

Notes: No. = number; AIC = Akaike Information Criterion.