Table 3

Multivariate logistic regressions on ‘ever smoked a cigarette’ in 2016

Variable	Model 1—adjusted main effects model (n=1806)			Model 2—adjusted model including interactions (n=1806)			Model 3—imputed model with interactions (n=2520)
	OR	CI	p	OR	CI	p	OR	CI	p
E-cigarette ever use 2015	2.42	1.63 to 3.60	<0.001	5.97	3.12 to 11.40	<0.001	6.64	3.60 to 12.26	<0.001
Susceptibility to smoking 2015	3.65	2.70 to 4.94	<0.001	4.13	2.98 to 5.72	<0.001	5.19	3.74 to 7.21	<0.001
Any family member smokes 2015	1.89	1.40 to 2.56	<0.001	1.93	1.43 to 2.61	<0.001	1.83	1. 37 to 2.44	<0.001
‘At least some’ friends smoke 2015	1.33	0.95 to 1.85	0.094	1.56	1.09 to 2.25	0.016	1.51	1.07 to 2.14	0.020
Interaction between e-cigarette and susceptibility				0.42	0.19 to 0.94	0.036	0.42	0.20 to 0.88	0.021
Interaction between e-cigarette and friends smoking				0.49	0.23 to 1.07	0.072	0.52	0.25 to 1.09	0.082