Figure 1From: Association between respiratory tract diseases and secondhand smoke exposure among never smoking flight attendants: a cross-sectional surveyAssociation between total hours in a smoky airplane cabin and respiratory tract diseases. The values presented correspond to the age-adjusted odds ratio (OR) and corresponding 95% confidence interval. The OR is calculated for an increase of 16,720 hours which corresponds to the difference between the 25th and 75th percentile of the observed distribution.Back to article page