Table 3.

Proportions of youth (unadjusted) with exposure to Internet-based tobacco advertising and branding, and results from logistic regression analyses predicting exposure (results from landline sample).

Characteristic		Exposeda to tobacco advertising/promotion (n=7856)					Exposeda to tobacco company branding (n=7858)
		%b	ORc,d	95% CI		P	%b	ORc	95% CI		P
Year
	2010	21	0.66	0.57	0.77	<.001	20	0.71	0.61	0.83	<.001
	2011	24	0.81	0.70	0.94	.006	22	0.82	0.70	0.95	.010
	2012	27	0.92	0.80	1.07	.284	26	0.98	0.84	1.14	.780
	2013	29	(refe)				26	(ref)
Age, years
	12-15	33	2.12	1.81	2.49	<.001	32	2.58	2.18	3.04	<.001
	16-19	27	1.61	1.40	1.86	<.001	25	1.79	1.54	2.08	<.001
	20+	17	(ref)				15	(ref)
Sex
	Female	29	(ref)				26	(ref)
	Male	22	0.71	0.64	0.79	<.001	21	0.77	0.69	0.86	<.001
State
	NSWf	26	(ref)				23	(ref)
	QLDg	25	0.96	0.87	1.07	.499	24	1.05	0.94	1.18	.348
SESh,j	Low	28	(ref)				27
	Moderate-high	24	0.83	0.74	0.94	.003	22	0.81	0.72	0.92	<.001
Smoking
	Never-smoker	30	(ref)				27	(ref)
	Experimenter	22	0.81	0.70	0.94	.006	21	0.87	0.74	1.01	.065
	Current or ex-smoker	12	0.37	0.29	0.47	<.001	13	0.44	0.35	0.57	<.001
Friends who smoke		N/Ai	1.08	1.03	1.13	.001	N/A	1.10	1.05	1.15	<.001
Household members who smoke		N/A	1.08	1.01	1.15	.030	N/A	1.12	1.05	1.20	.001
Internet, hours		N/A	1.04	1.02	1.06	<.001	N/A	1.04	1.02	1.06	<.001

^aExposure=sometimes or often exposed versus never or rarely.

^bPercentages are weighted.

^cOdd ratios are from multivariable analyses.

^dOR: odds ratio.

^eref: reference category.

^fNSW: New South Wales.

^gQLD: Queensland.

^hSES: socioeconomic status.

ⁱN/A: not applicable.

^jBased on postal code.