Chronic respiratory disease in four occupational groups.
D000367:Age Factors; D000383:Agriculture; D001249:Asthma / Q000453:epidemiology; D001827:Body Height; D001991:Bronchitis / Q000453:epidemiology; D002617:Chemical Industry; D004781:Environmental Exposure; D005390:Fires; D006801:Humans; D008297:Male; D009787:Occupational Medicine; D009790:Occupations; D009864:Ontario; D010820:Physicians; D012044:Regression Analysis; D012129:Respiratory Function Tests; D012140:Respiratory Tract Diseases / Q000453:epidemiology*; D012907:Smoking / Q000503:physiopathology; D013147:Spirometry