Table 1.

Model fitting of measurement model for addiction resistance to alcohol, nicotine and cannabis as assessed on two occasions.

#	Model	Estimate variables	AR to alcohol			AR to nicotine			AR to cannabis
			−2LL	DF	ΔAIC	−2LL	DF	ΔAIC	−2LL	DF	ΔAIC
1	Full Model	A, C, E, As, Cs, Es	31,684.677	4859	–	15,750.251	2424	–	7929.307	1739	–
2	A = 0, As = 0	C, E, Cs, Es	31,705.194	4862	14.517	15,767.537	2427	11.286	7939.929	1742	4.622
3	C = 0, Cs = 0	A, E, As, Es	31,684.959	4862	−5.718a	15,750.251	2427	−6.000	7929.372	1742	−5.935
4	C = 0, As = 0, Cs = 0	A, E, Es	31,692.614	4864	−2.063	15,750.251	2429	−10.000a	7929.394	1744	−9.913a

A = genetic; C = common environment; E = unique environment; As = genetic specifics; Cs = common environment specifics and Es = unique environment specifics

^aBest fit model.