Table 2

Relative strength of association with chronic bronchitis of genetic, lifestyle, clinical, and sociodemographic characteristics

OR (95% CI) p Value
Smokingv not2.5 (1.8 to 3.4)<0.001
Inhalationv not1.7 (1.3 to 2.3)<0.001
Alcohol use, different categories referencing abstainers:<0.001
 Moderate use (1–21 drinks/week):0.8 (0.6 to 1.1)
 More than moderate (22–35 drinks/week):1.1 (0.7 to 1.6)
 Heavy use (>35 drinks/week):1.4 (0.95 to 2.1)
Retiredv not1.4 (1.1 to 1.7)0.002
Systolic blood pressure (mm Hg, risk associated with a one unit change)0.99 (0.98 to 0.997)0.002
Height (cm, risk associated with a one unit change)0.98 (0.96 to 0.99)0.004
NS-phenotype v others0.7 (0.6 to 0.99)0.038
  • Not in the final model (p>0.10): social class, weight, age.

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