Table 4.

Ordinal logistic regression of cigarette use at age 16 and Psychotic Experiences at age 18

Model	n = 1756 (excluding PEs at 12)			n = 1573 (excluding PEs at 12 and 16)
	Odds Ratio	95% CI	p value	Odds Ratio	95% CI	p value
1	1.61	1.31, 1.98	<0.001	1.62	1.23, 2.13	0.001
2	1.59	1.29, 1.96	<0.001	1.60	1.21, 2.13	0.001
3	1.53	1.23, 1.91	<0.001	1.63	1.22, 2.18	0.001
4a	1.42	1.05, 1.92	0.022	1.67	1.14, 2.45	0.008
4b	1.54	1.20, 1.98	0.001	1.85	1.32, 2.60	<0.001
4c	1.29	1.00, 1.68	0.051	1.52	1.09, 2.13	0.015
5	1.36	0.99, 1.86	0.055	1.77	1.18, 2.66	0.006

Model 1: PE at 18 by categorical frequency of cigarette use at 18.

Model 2: as model 1 with additional adjustment for pre birth confounders (family history of depression, maternal education).

Model 3: as model 2 with additional adjustment for childhood confounders (borderline personality, IQ at age 8, depression at age 12, conduct disorder trajectory group membership, peer problems, bullied).

Model 4a: as model 3 with additional adjustment for cannabis use.

Model 4b: as model 3 with additional adjustment for alcohol use.

Model 4c: as model 3 with additional adjustment for illicit drug use (other than cannabis).

Model 5: as model 3 with additional adjustment for cannabis, alcohol and other illicit drug use.