Table 1.

Model Estimates for Associations Between Cannabis Involvement and PLEs^a

	Frequent Cannabis Use					CUD					Current Cannabis Use
	β	lower CI	upper CI	t	p	β	lower CI	upper CI	t	p	β	lower CI	upper CI	t	p
Sexb	−0.02	−0.05	0.01	−1.08	.28	−0.01	−0.04	0.01	−0.91	.36	−0.02	−0.05	0.01	−1.32	.19
Age	−0.04	−0.07	−0.01	−2.52	.01	−0.04	−0.07	−0.01	−2.51	.01	−0.04	−0.07	−0.01	−2.27	.02
MZ	−0.06	−0.10	−0.02	−3.24	.001	−0.06	−0.10	−0.02	−3.17	.002	−0.06	−0.10	−0.02	−3.02	.003
DZ	−0.07	−0.11	−0.03	−3.39	.001	−0.07	−0.11	−0.03	−3.33	.001	−0.06	−0.10	−0.02	−3.10	.002
Samplec	0.03	−0.01	0.07	1.66	.10	0.02	−0.02	0.06	1.11	.27	0.02	−0.01	0.06	1.23	.22
Household Income	−0.15	−0.18	−0.12	−9.28	<.001	−0.15	−0.18	−0.12	−9.56	<.001	−0.15	−0.18	−0.12	−9.57	<.001
Lifetime Smoking	0.03	0.00	0.06	1.88	.06	0.03	0.00	0.06	1.97	.049	0.05	0.02	0.08	3.06	.002
Lifetime Drinking	0.01	−0.02	0.04	0.89	.37	0.01	−0.02	0.04	0.79	.43	0.02	−0.01	0.05	1.17	.24
Lifetime Other Illicit Drug Use	0.09	0.06	0.13	5.81	<.001	0.09	0.06	0.12	5.60	<.001	0.11	0.08	0.14	6.75	<.001
Cannabis Involvement Variable	0.11	0.08	0.14	6.71	<.001	0.13	0.09	0.16	7.89	<.001	0.07	0.04	0.10	4.73	<.001

Abbreviations: β=standardized regression coefficient; CI=95% bootstrapped (5000 iterations) Confidence Interval; t=t-test test statistic; p=p-value; CUD=cannabis abuse/dependence; MZ=monozygotic; DZ=dizygotic.

^aSignificant model estimates are in bold.

^bFemale as reference group for sex.

^cAustralian Twin Registry as reference group for sample.