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

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

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