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Table 3 Associations between frequency of exposure to household secondhand aerosols (SHA) from electronic cigarettes in the past 7 days and asthma symptoms

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
Household secondhand aerosol exposure in past 7 days % (n/total) aPR* (95% CI) % (n/total) aPR* (95% CI) % (n/total) aPR* (95% CI)
No exposure (0 days) 24.1 (215/894) 1.00 (Reference) 14.1 (124/894) 1.00 (Reference) 12.0 (107/894) 1.00 (Reference)
Infrequent exposure (1–2 days) 30.3 (40/132) 1.17 (0.87–1.58) 22.7 (30/132) 1.49 (1.01–2.23) 18.9 (25/132) 1.53 (1.00–2.33)
Frequent exposure (≥ 3 days) 38.8 (120/309) 1.30 (1.04–1.59) 27.2 (84/309) 1.56 (1.13–2.16) 27.8 (86/309) 1.88 (1.35–2.62)
  1. aPR: adjusted prevalence ratio; CI: confidence interval
  2. * Adjusted for sex, age, cigarette smoking status, electronic cigarette use status, exposure to household secondhand smoke, and exposure to secondhand smoke and/or secondhand aerosols from electronic cigarettes in public places