Prevalence of Respiratory Symptoms Among Wheat Flour Mill Workers in Ibadan, Nigeria

of the same flour mill factory, and 121 matched external controls. Results Fifty-four percent of the flour-millers reported at least one respiratory symptom compared with 30% of the internal controls (P <0.05) and 19% of the external controls (P <0.001). Most symptoms were significantly more prevalent among the flourmillers compared with control subjects, and this trend was more evident amongst nonsmokers than ex-smokers. Conclusions The study concluded that wheat flour mill workers in Nigeria, like grain workers elsewhere, were at an increased risk of developing both pulmonary and nonpulmonary symptoms compared with control subjects. The result has implications for improveddustcontrolmeasuresinthegrainindustryinNigeria. Am. J. Ind. Med. 45:251– 259, 2004. 2004 Wiley-Liss, Inc.