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 | Â | Â | <.001 | Â |
  Girl | 0.7 | (0.5, 0.9) |  | 1 |
  Boy | 1.6 | (1.4, 1.8) |  | 1.94 (1.38, 2.73)** |
Parental smoking | Â | Â | .003 | Â |
  No | 1.0 | (0.8, 1.2) |  | 1 |
  Yes | 1.4 | (1.2, 1.7) |  | 1.00 (0.73, 1.37) |
Peer smoking | Â | Â | <.001 | Â |
  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 | Â | Â | <.001 | Â |
  Good | 0.7 | (0.6, 0.8) |  | 1 |
  Poor | 4.6 | (3.8, 5.5) |  | 1.67 (1.16, 2.40)* |
Attitudes toward smoking | Â | Â | <.001 | Â |
  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 | Â | Â | <.001 | Â |
  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 | Â | Â | <.001 | Â |
  No | 0.7 | (0.6, 0.8) |  | 1 |
  Yes | 15.9 | (13.2, 19.0) |  | 3.59 (2.25, 5.72)** |
Alcohol consumption | Â | Â | <.001 | Â |
  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)** |