Table 6.

Proportions of nonsmoking youth (unadjusted) susceptible to smoking, and results from logistic regression analyses predicting smoking susceptibility (results from landline sample).

Characteristic		12- to 17-year-olds (n=3377)						18- to 24-year-olds (n=1594)
		%a	ORb,c	95% CI		P	%a	ORb	95% CI		P
Exposure
	Never/rarely	23	(reff)				13		(ref)
	Exposedd to online adsg and branding	29	1.32	1.11	1.57	.002	16	1.30	0.92	1.83	.137
	Exposedd to online branding only	30	1.39	1.10	1.77	.007	11	0.76	0.44	1.31	.315
Year
	2010	24	1.00	0.79	1.25	.967	10	0.64	0.41	1.00	.049
	2011	25	1.06	0.85	1.32	.610	13	0.80	0.53	1.22	.301
	2012	29	1.22	0.98	1.52	.069	15	0.99	0.67	1.46	.955
	2013	25	(ref)				15		(ref)
Sex
	Female	23	(ref)				12	(ref)
	Male	28	1.30	1.11	1.53	.001	15	1.43	1.05	1.93	.021
State
	NSWc	25	(ref)				13		(ref)
	QLDh	26	0.99	0.85	1.16	.931	14	1.11	0.82	1.51	.480
SESe,i
	Low	24	(ref)				15		(ref)
	Moderate-high	26	1.13	0.94	1.36	.187	13	0.88	0.63	1.23	.445
Friends who smoke		N/Aj	1.23	1.13	1.34	<.001	N/A	1.04	0.93	1.16	.495
Household members who smoke		N/A	1.16	1.05	1.29	.005	N/A	1.22	1.00	1.50	.050
Internet, hours		N/A	1.05	1.01	1.09	.009	N/A	0.99	0.94	1.04	.697

^aPercentages are weighted.

^bOdds ratios are from weighted analyses.

^cOR: odds ratio.

^dExposure=sometimes or often exposed.

^eBased on postal code.

^fref: reference category.

^gads: advertisements.

^hQLD: Queensland.

ⁱSES: socioeconomic status.

^jN/A: not applicable.