Table 5

Logistic regressions predicting perceived comparative risk of e-cigarettes to cigarettes at post-test and dual use intentions

PredictorsPerceived comparative risk of e-cigarettes to cigarettes at post-testDual use intentions
Less harmful (vs more or equally harmful or I don’t know)
OR (95% CI)
Exclusive e-cigarettes use (vs dual use)
OR (95% CI)
Cessation (vs dual use)
OR (95% CI)
Female (vs male)0.78 (0.58 to 1.05)1.23 (0.80 to 1.88)1.55 (0.99 to 2.44)
Age in years1.01 (1.00 to 1.02)1.02 (1.01 to 1.03)**1.02 (1.002 to 1.03)*
White (vs non-white)0.83 (0.57 to 1.21)1.03 (0.63 to 1.70)1.04 (0.61 to 1.76)
Less than college (vs college or higher)1.28 (0.95 to 1.74)1.46 (0.94 to 2.28)1.48 (0.95 to 2.31)
Daily smoking (vs no)0.95 (0.66 to 1.36)0.55 (0.34 to 0.88)*0.66 (0.40 to 1.11)
Ever but not current e-cigarettes use (vs never)1.40 (0.98 to 2.01)0.99 (0.50 to 1.96)0.52 (0.30 to 0.88)*
Current e-cigarettes use (vs never)1.62 (1.14 to 2.30)**1.55 (0.91 to 2.65)0.13 (0.07 to 0.22)***
Tried to quit in the past 12 months (vs no)0.85 (0.61 to 1.16)0.68 (0.44 to 1.07)0.29 (0.17 to 0.48)***
Perceived comparative risk of e-cigarettes to cigarettes at pretest (less harmful vs others)24.59 (17.79 to 33.99)***1.84 (1.21 to 2.79)**0.46 (0.29 to 0.73)**
Response efficacy at pretest1.13 (1.04 to 1.24)**1.12 (0.97 to 1.29)1.06 (0.92 to 1.22)
Self-efficacy at pretest0.89 (0.82 to 0.96)**1.24 (1.11 to 1.38)***1.60 (1.42 to 1.81)***
Smoking identity0.98 (0.92 to 1.03)0.90 (0.83 to 0.98)*0.73 (0.67 to 0.80)***
Comparative risk messages and negative comparative risk messages (vs control)1.29 (1.12 to 1.48)***1.18 (0.96 to 1.46)1.02 (0.84 to 1.25)
Comparative risk messages (vs negative comparative risk messages)1.13 (0.97 to 1.31)1.03 (0.83 to 1.27)0.92 (0.74 to 1.16)
  • Perceived comparative risk of e-cigarettes to cigarettes at post-test: less harmful=47.3% and others=52.5%. Dual use intentions: dual use=40.4%, exclusive e-cigarettes use=9.6% and cessation=13.9%.

  • *p<0.05.

  • **p<0.01.

  • ***p<0.001.

  • e-cigarette, electronic cigarette.