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Table 2 Associations between electronic cigarette use and asthma symptoms according to cigarette smoking status

From: Use of electronic cigarettes and secondhand exposure to their aerosols are associated with asthma symptoms among adolescents: a cross-sectional study

  Current wheeze Current asthma Current uncontrolled asthma symptoms
Cigarette and e-cigarette use % (n/total) aPR* (95% CI) % (n/total) aPR* (95% CI) % (n/total) aPR* (95% CI)
Never cigarette smoker
 Never e-cigarette use 21.2 (141/665) 1.00 (Reference) 13.4 (89/665) 1.00 (Reference) 11.7 (78/665) 1.00 (Reference)
 Former e-cigarette use 30.2 (13/43) 1.30 (0.75–2.23) 16.3 (7/43) 1.43 (0.70–2.92) 14.0 (6/43) 1.34 (0.63–2.86)
 Current e-cigarette use 31.4 (11/35) 1.54 (1.01–2.45) 25.7 (9/35) 1.85 (1.03–3.41) 22.9 (8/35) 1.56 (0.80–3.06)
Former cigarette smoker
 Never e-cigarette use 27.2 (28/103) 1.26 (0.89–1.80) 22.3 (23/103) 1.67 (1.08–2.58) 17.5 (18/103) 1.42 (0.88–2.32)
 Former e-cigarette use 27.5 (19/69) 1.24 (0.81–1.92) 14.5 (10/69) 1.11 (0.58–2.11) 14.5 (10/69) 1.18 (0.63–2.23)
 Current e-cigarette use 33.3 (24/72) 1.52 (1.05–2.21) 20.8 (15/72) 1.71 (1.05–2.78) 27.8 (20/72) 2.28 (1.45–3.58)
Current cigarette smoker
 Never e-cigarette use 36.4 (16/44) 1.64 (1.06–2.55) 20.5 (9/44) 1.73 (1.01–3.21) 13.6 (6/44) 1.01 (0.43–2.38)
 Former e-cigarette use 36.7 (18/49) 1.57 (1.02–2.43) 22.5 (11/49) 1.89 (1.05–3.43) 26.5 (13/49) 2.34 (1.38–3.99)
 Current e-cigarette use 41.9 (111/265) 1.87 (1.44–2.42) 26.0 (69/265) 1.92 (1.33–2.76) 24.9 (66/265) 1.97 (1.35–2.88)
  1. aPR adjusted prevalence ratio, CI confidence interval
  2. * Adjusted for sex, age, exposure to household secondhand smoke, exposure to household secondhand aerosols from electronic cigarettes, and exposure to secondhand smoke and/or secondhand aerosols from electronic cigarettes in public places