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Table 4 Relation between different levels of exposure to ETS and severity of respiratory problems of adult non-smokers in Aleppo-Syria

From: Extent of exposure to environmental tobacco smoke (ETS) and its dose-response relation to respiratory health among adults

  ETS score*  
Severity of respiratory problems middle high P Dose-response
Number of wheezing attacks in the past year (≤12 vs. >12) 0.6 (0.2–2.2) 1.2 (0.3–4.5) 0.6
Number of episodes of sinusitis (once vs. more than once) 0.5 (0.2–1.4) 1.2 (0.4–4.1) 0.3
Number of episodes of acute lower respiratory tract infection (once vs. more than once) 1.4 (0.4–4.6) 0.7 (0.2–2.3) 0.3
Past year doctor's or hospital visit because of respiratory problems 1.4 (0.9–2.1) 1.2 (0.7–2.0) 0.4
Past month medication use for respiratory problems 1.0 (0.5–1.7) 1.0 (0.5–1.9) 0.7
  1. * Odds ratio and 95% confidence interval for the relation between ETS score tertiles (lower being referent) and respiratory symptoms/diagnosis according to multivariate logistic regression adjusted for age, gender, SES score, hay fever, parental allergy, pack-years (for ex-daily smokers), occupational exposure to respirable pollutants other than ETS