Exposure to e-cigarette advertising, attitudes, and use susceptibility in adolescents who had never used e-cigarettes or cigarettes

Table 2 Odds ratios of attitudes towards ECs and the tobacco industry by exposure to EC advertising

a. Attitudes towards ECs
	Uncertain that EC use harms health		Tolerant attitudes towards EC use
	Crude OR	Adjusted OR	Crude OR	Adjusted OR
	(95% CI)^a	(95% CI)^b	(95% CI)^a	(95% CI)^b
Exposure to EC advertising
No	1	1	1	1
Yes	1.18 (1.05, 1.32)^**	1.17 (1.05, 1.31)^**	1.21 (1.07, 1.37)^**	1.21 (1.07, 1.36)^**
1 type	1.14 (1.00, 1.29)^*	1.13 (1.00, 1.29)^*	1.20 (1.05, 1.38)^**	1.19 (1.04, 1.37)^*
≥ 2 types	1.30 (1.08, 1.57)^**	1.29 (1.06, 1.55)^**	1.25 (1.02, 1.53)^*	1.25 (1.02, 1.53)^*
P for trend ^c	< 0.01	< 0.01	< 0.01	< 0.01
b. Attitudes towards the tobacco industry
	The tobacco industry is respectable		Tobacco companies make youth smoke
	Crude OR	Adjusted OR	Crude OR	Adjusted OR
	(95% CI)^a	(95% CI)^b	(95% CI)^a	(95% CI)^b
Exposure to EC advertising
No	1	1	1	1
Yes	1.42 (1.27, 1.60)^***	1.42 (1.26, 1.59)^***	1.09 (0.98, 1.22)	1.09 (0.98, 1.22)
1 type	1.36 (1.20, 1.55)^***	1.36 (1.19, 1.55)^***	1.08 (0.96, 1.22)	1.08 (0.96, 1.22)
≥ 2 types	1.59 (1.31, 1.92)^***	1.58 (1.30, 1.91)^***	1.12 (0.93, 1.34)	1.11 (0.92, 1.33)
P for trend ^c	< 0.001	< 0.001	0.11	0.12

^*P < 0.05, ^**P < 0.01, ^***P < 0.001
^aCI = confidence interval. OR = odds ratio
^bWith adjustment for sex, grade, perceived family affluence, parental cigarette/EC use and school clustering effects
^cP values for linear trends of exposure to 0, 1, and ≥ 2 types of EC advertising

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