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Table 3 Association of respiratory tract diseases with the duration of time spent in a smoky cabin*

From: Association between respiratory tract diseases and secondhand smoke exposure among never smoking flight attendants: a cross-sectional survey

   Quartiles of Total Hours Spent in Smoky Cabin
Disease Overall Q1 Q2 Q3 Q4
Any respiratory disease      
   Odds Ratio 1.17 1.0 1.02 1.03 1.62
   (95% C. I.) (0.97, 1.42)   (0.70, 1.49) (0.70, 1.52) (1.06, 2.48)
Sinusitis      
   Odds Ratio 1.21 1.0 1.09 1.50 1.47
   (95% C. I.) (1.03, 1.44)   (0.76, 1.56) (1.04, 2.18) (1.00, 2.16)
Allergies      
   Odds Ratio 1.01 1.0 0.93 1.13 1.03
   (95% C. I.) (0.85, 1.20)   (0.65, 1.34) (0.78, 1.64) (0.70, 1.5)
Bronchitis      
   Odds Ratio 1.04 1.0 1.41 1.40 1.36
   (95% C. I.) (0.87, 1.25)   (0.95, 2.09) (0.93, 2.10) (0.89, 2.06)
Middle Ear Infections      
   Odds Ratio 1.30 1.0 1.16 2.08 2.22
   (95% C. I.) (1.08, 1.57)   (0.74, 1.84) (1.33, 3.25) (1.40, 3.52)
Asthma      
   Odds Ratio 1.26 1.0 1.20 1.54 1.43
   (95% C. I.) (1.01, 1.57)   (0.69, 2.11) (0.89, 2.67) (0.81, 2.52)
Hay Fever      
   Odds Ratio 0.92 1.0 1.35 1.24 0.89
   (95% C. I.) (0.71, 1.18)   (0.81, 2.27) (0.72, 2.13) (0.50, 1.59)
Pneumonia      
   Odds Ratio 1.09 1.0 1.02 1.40 1.71
   (95% C. I.) (0.86, 1.39)   (0.57, 1.85) (0.79, 2.48) (0.96, 3.03)
COPD      
   Odds Ratio 1.43 1.0 0.91 1.12 1.46
   (95% C. I.) (0.89, 2.32)   (0.22, 3.72) (0.29, 4.37) (0.39, 5.51)
  1. * To assess whether the diagnosis of disease after the age of 18 years was associated with the duration of time spent in a smoky cabin a series of logistic regression analyses were performed. An overall analysis was performed with the duration of time spent in a smoky cabin analyzed as a continuous variable and a supplemental analysis was performed with duration of time spent in a smoky cabin analyzed as a categorical variable with categories defined using quartiles of the observed distribution (≤11030 hours, 11031 to 18240 hours, 18241 to 27750 hours, and ≥27751 hours). The respondent's age at the time the survey was included as a covariate in all models. Findings from the logistic regression analyses are summarized using odds ratios (ORs) and corresponding 95% confidence intervals (CIs). For the analysis with time spent in the smoky cabin treated as a continuous variable, 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. For the analysis with time spent in the smoky cabin treated as a categorical variable, the ORs are calculated using the lower quartile group as the reference group. † p ≤ 0.05