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BACKGROUND Workers are exposed to physical, chemical and other hazards in the workplace, which may impact their respiratory health. AIMS To examine the healthy worker effect in the Canadian working population and to identify the association between occupation and respiratory health. METHODS Data from four cycles of the Canadian Health Measures Survey were utilized. The current occupation of employed participants was classified into 10 broad categories based on National Occupation Category 2011 codes. Data relating to 15 400 subjects wer