Table 4

Relative strength of association between chronic bronchitis and long term occupational exposure to physical and chemical factors adjusted for social class and age

OR (95% CI) p Value
Cold and draught exposure v not1.4 (1.1 to 1.7)0.002
Dust exposure v not1.5 (1.1 to 2.0)0.020
Social class IV/V v I, II, III1.2 (0.99 to 1.5)0.063
Organic solvent exposurev not1.3 (0.99 to 1.8)0.066
  • Not in the final model (p>0.10): age, plastic (manufacture of or exposure to vapours), strong variations of temperature, strong heat, moist and humidity, asbestos, soldering fumes, welding fumes, vapours (from lacquer, paint, and varnish), glass fibre.

  • Variables are ordered according to strength of association with bronchitis after multivariate adjustment in a logistic regression model with backward elimination of variables.