The prevalence of chronic bronchitis, chronic airway obstruction, and respiratory symptoms in a Colorado city.
D000328:Adult; D000367:Age Factors; D001249:Asthma / Q000453:epidemiology*; D001991:Bronchitis / Q000453:epidemiology*; D002908:Chronic Disease; D003032:Coal Mining; D003120:Colorado; D006801:Humans