Table 7– Multivariate analysis of factors associated with having chronic bronchitis# among individuals with chronic obstructive pulmonary disease
VariableOR (95% CI)p-value
Wheeze2.40 (1.40–4.12)0.002
Dyspnoea2.42 (1.36–4.29)0.003
Pack-yrs per additional pack-yr1.02 (1.01–1.02)<0.001
General health status good to excellent0.60 (0.36–0.99)0.049
Age per additional year0.97 (0.95–0.99)0.006
Any respiratory medication1.93 (1.05–3.56)0.035
  • #: defined as phlegm on most days, at least 3 months per year for ≥2 yrs.