-

Health survey of workers of an aluminum plant in China: III. Respiratory symptoms and ventilatory functions.

Discussion The present epidemiological study on the prevalence of respiratory disease was carried out according t o t h e most widely and comprehensively validated MRC questionnaire. The questionnaire is characterized by its making group comparison of the prevalence of individual symptoms singly or in combination, instead of searching for names of specific diseases such as bronchitis. The results obtained from this study clearly indicate the effect of working environment on the respiratory syst