Table 2.

Participant characteristics by e-cigarette advertising exposures.

	Any Exposure to TV, Retail, Online/Social Media Ad/Content			No Exposure to TV, Retail, Online/Social Media Ad/Content
	n	Wt.%	95% CI	n	Wt.%	95% CI	p *
E-cigarette use at follow-up							<0.001
No	1273	87.8	85.0, 90.1	760	95.9	93.3, 97.5
Yes	188	12.2	10.0, 15.0	27	4.1	2.5, 6.7
Baseline Characteristics:
Cigarette smoker							0.07
No	1392	94.0	91.5, 95.8	775	97.1	94.0, 98.6
Yes	65	6.0	4.2, 8.5	11	2.9	1.4, 6.0
E-cigarette ever user							0.002
No	1305	87.7	84.7, 90.2	761	94.3	91.2, 96.4
Yes	159	12.3	9.8, 15.3	30	5.7	3.6, 8.8
Sex							0.83
Male	624	47.3	43.5, 51.2	344	48.0	43.0, 53.0
Female	839	52.7	48.9, 56.5	447	52.1	47.0, 57.0
Age groups							0.08
13–20	917	65.1	61.6, 68.5	539	59.8	54.9, 64.6
21–24	547	34.9	31.5, 38.4	252	40.2	35.4, 45.1
Race/Ethnicity							<0.001
White, NH	679	50.1	46.3, 53.9	469	63.7	59.0, 68.2
Black, NH	287	17.0	14.3, 20.1	78	8.6	6.4, 11.5
Other/2+ races, NH	97	6.5	4.8, 8.8	61	7.5	5.2, 10.6
Hispanic	297	22.0	19.0, 25.5	149	18.2	15.0, 22.0
Asian, NH	104	4.4	3.2, 5.9	34	2.0	1.3, 3.1
Household Income							0.52
<USD 25,000	374	25.7	22.3, 29.4	155	22.2	18.2, 26.8
USD 25,000–USD 49,999	337	22.1	19.3, 25.2	158	21.1	16.9, 26.0
USD 50,000–USD 99,999	433	28.6	25.3, 32.1	281	30.7	26.6, 35.1
USD 100,000+	320	23.7	20.7, 27.0	197	26.1	22.1, 30.6
Region							0.26
Northeast	242	17.0	14.3, 20.0	121	17.2	13.2, 22.1
Midwest	309	20.6	17.8, 23.7	212	24.9	21.0, 29.2
South	621	39.1	35.5, 42.9	287	33.6	29.2, 38.3
West	292	23.3	20.2, 26.8	171	24.3	20.4, 28.8

* p-values obtained from chi-square tests.