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Table 2 Prevalence of current e-cigarette use and its associated factors among adolescents in Hong Kong

From: Electronic cigarette use among adolescents: a cross-sectional study in Hong Kong

  % (95 % CI) P-value for x 2 or t-test AORa (95 % CI)
Age, Mean (SD) 15.4 (2.0) <.001 0.96 (0.88, 1.05)
Sex    <.001  
  Girl 0.7 (0.5, 0.9)   1
  Boy 1.6 (1.4, 1.8)   1.94 (1.38, 2.73)**
Parental smoking    .003  
  No 1.0 (0.8, 1.2)   1
  Yes 1.4 (1.2, 1.7)   1.00 (0.73, 1.37)
Peer smoking    <.001  
  No 0.3 (0.2, 0.4)   1
  Less than half 1.3 (1.1, 1.6)   1.16 (0.69, 1.96)
  Half or more 6.1 (5.1, 7.3)   1.28 (0.72, 2.27)
Knowledge about the harm of cigarette smoking    <.001  
  Good 0.7 (0.6, 0.8)   1
  Poor 4.6 (3.8, 5.5)   1.67 (1.16, 2.40)*
Attitudes toward smoking    <.001  
  Negative 0.5 (0.4, 0.6)   1
  Neutral 2.3 (1.9, 2.8)   0.98 (0.66, 1.45)
  Positive 9.9 (7.7, 12.5)   1.09 (0.62, 1.92)
Cigarette smokingb    <.001  
  Never smoker 0.1 (0.1, 0.2)   1
  Experimental smoker 2.0 (1.5, 2.7)   9.22 (5.57, 15.27)**
  Former smoker 9.6 (7.5, 12.1)   23.33 (13.38, 40.68)**
  Current smoker 9.6 (7.8, 11.9)   18.17 (10.08, 32.76)**
Other tobacco usec    <.001  
  No 0.7 (0.6, 0.8)   1
  Yes 15.9 (13.2, 19.0)   3.59 (2.25, 5.72)**
Alcohol consumption    <.001  
  Non-drinker 0.3 (0.2, 0.3)   1
  <1 day/month 1.0 (0.7, 1.3)   1.93 (1.26, 2.96)*
  ≥1 day/month 5.2 (4.4, 6.0)   3.16 (2.12, 4.72)**
  1. Note. AOR adjusted odds ratio, CI confidence interval
  2. aMultivariable logistic regression model adjusted for all variables listed in the table
  3. bNever smokers have never smoked a cigarette ; Experimental smokers smoked once or a few times; Former smokers smoked in the past but not now; Current smokers reported smoking now and smoked on at least one day in the past 30 days
  4. cOther tobacco use includes using any of the following in the past 30 days: waterpipe, chewing tobacco, cigars, snus, smoking pipe/snuff, or any other form of tobacco (other than cigarettes and e-cigarettes)
  5. * p < .01; ** p < .001