An epidemiological study of the diffuse obstructive pulmonary syndrome.
D000328:Adult; D000367:Age Factors; D000368:Aged; D002908:Chronic Disease; D005260:Female; D005541:Forced Expiratory Volume; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D008297:Male; D008875:Middle Aged; D012737:Sex Factors; D012907:Smoking / Q000150:complications / Q000453:epidemiology; D013019:South Africa; D014797:Vital Capacity