Table 4.

Model fitting procedure with fit statistics. Submodels were adopted if the AIC was negative.

#	Model Description	Comparison	Δdf	Δχ2	p-value	ΔAIC
1	Full		(7793)	(15897.445)	n/a	(311.445)
2	Constrain variance to be equal across sexes	2 vs. 1	63	47.238	0.931	−78.762
3	AE Model	3 vs. 2	21	40.938	0.006	−1.062
4	CE Model	4 vs. 2	21	71.151	<0.001	29.151
5	Drop all loadings from C1, C3, and C5	5 vs. 2	12	4.972	0.959	−19.028
6	Drop loadings onto SxAnxDep from C2 & C4	6 vs. 5	3	4.923	0.178	−1.077
7	Drop cross-wave genetic effects	7 vs. 6	12	169.430	<0.001	145.430
8	Drop genetic correlations between SxAnxDep and IntoxFreq*	8 vs. 6	9	4.676	0.854	−13.324
9	Drop cross-wave unique environmental effects	9 vs. 8	12	71.779	<0.001	47.779
10	Drop unique environmental correlations between SxAnxDep and IntoxFreq	10 vs. 8	9	28.318	0.001	10.318

^*This submodel became the Final Model referred to in the text.