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Table 2 Hazard ratios (HR) with 95% confidence intervals (CI) for respiratory work disability (i.e. changing work due to respiratory symptoms) in a cohort of pulp mill workers exposed to irritant gases (gassings).

From: Risk factors for respiratory work disability in a cohort of pulp mill workers exposed to irritant gases

Variable 1 HR 95% CI
Exposure (gassings) 2 5.3 2.7-10.5
Asthma2 6.7 4.1-11.0
Chronic bronchitis2 1.8 1.1-3.1
Chronic rhinitis2 1.8 1.1-3.0
ETS exposure at work in pulp industry2 1.5 0.9-2.5
  1. 1; Mutual adjustments for the variables expressed with HR
  2. 2; Yes = 1, No = 0
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