Geoffrey L. Brinkman, M.D., F.A.C.P.; Duane L. Block, M.D.
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In 1959, 301 men, ages 40 to 65 years, who were working full time, were selected for inclusion in this prospective study. On the basis of their work they were classified into three occupational groups: group 1, assembly line work with no silica exposure (134 men); group 2, at least 20 years' exposure to silica dust in a foundry (122 men); and group 3, at least 20 years' exposure to silica dust in a foundry, with X-ray evidence of silicosis (45 men). These men were further classified as to whether they had bronchitis on the basis of cough and sputum,
Brinkman GL, Block DL. The Effects of Bronchitis and Occupation on Ventilation Over an 11-Year Period.. Ann Intern Med. ;74:839. doi: 10.7326/0003-4819-74-5-839_4
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Published: Ann Intern Med. 1971;74(5):839.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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