Effects of exposure to flour dust on respiratory symptoms and pulmonary function of mill workers

AbstractObjectiveTo assess the effect of exposure to flour dust on respiratory symptoms and lung function of flour mill workers and to estimate the additive effect of smoking on pulmonary function.Patients and methodsThis study was carried out at flour mills in Sohag Governorate. Two hundred male workers with current exposure to flour dust and two hundred non-exposed male as a control group were interviewed and self designed study questionnaire was administered to them and the parameters of their pulmonary function were measured.ResultsRespiratory symptoms such as cough, expectoration, wheezing, and shortness of breath, were significantly (p<0.0001) higher among exposed workers as compared to unexposed. Furthermore highly significant (p<0.0001) decrements in the pulmonary function of exposed subjects were noted. Moreover, a highly significant decline in FEV1%, FVC% and FEV1/FVC% was noticed regarding the duration of exposure to flour dust (p<0.0001). Also, there was a highly significant difference between heavily exposed compared to lightly exposed subjects (p<0.001).The additive effect of smoking was noticed as there was a highly significant decline of FVC%, FEV1%, FEV1/FVC%, FEF25% and FEF75% in smokers compared to non-smokers (p