LAUSR

Despite the absence of cases of silicosis, findings of increased current asthma, association of COPD and seeing a doctor for shortness of breath with duration of work, and the presence of obstructive changes in some non-smokers suggests the potential for adverse respiratory effects in the surface sand and gravel industry. Objective: Despite the large number of workers in surface sand and gravel mines, there are no previous studies on a cohort of these workers. Methods: A cross-sectional study of Michigan surface mine workers included a questionnaire and for those who worked ≥15 years spirometry and chest x-ray. Results: Questionnaires were completed by 1207 miners, 111 had an X-ray and 70 had spirometry. There were no silicosis cases. There were 117 with asthma, 22 COPD, 129 saw a doctor for shortness of breath (SOB), 125 with possible work-related asthma, and 26 abnormal spirometry results. Conclusions: Although, no cases of silicosis were identified, there was more current asthma; and an association of current asthma, COPD and seeing a doctor for SOB with time since first worked, and obstructive changes in some nonsmokers that suggested the potential for adverse respiratory effects.