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Proportion of workers who positively answered the question “Have you ever been told by a doctor or other health professional that you had chronic obstructive pulmonary disease, also called COPD?” Proportion of workers who positively answered the question “Have you ever been told by a doctor or other health professional that you had emphysema?” Proportion of workers who were solely identified as having COPD by a positive answer to the question “During the past 12 months, have you been told by a doctor or other health professional that you had chronic bronchitis?” For this report survey respondents with COPD were those who positively answered to any of these three questions.

Adults who reported “working at a job or business”; “with a job or business but not at work”; or “working, but not for pay, at a family–owned job or business” during the last 12 months of the survey interview and have never smoked.