title: Radiographic changes in a group of chrysotile miners and millers exposed to low asbestos dust concentrations.
abstract: Radiographic changes in 342 Quebec asbestos miners exposed to low levels of asbestos dust for an average period of 20 years were studied. Their estimated cumulative exposure ranged from 7 fibres per cubic centimeter X years (f-y/cc) to 300 f-y/cc. Of these workers, 2.1% showed a small opacity score of 1/0 or more and 2.7% showed pleural changes. No linear relationship could be established between small opacity score and any index of exposure to asbestos. Pleural changes were related to age. A referent group of office workers within the same mining industry showed a prevalence of 2.1% (1/48) for small irregular opacities 1/0 or more, and for pleural changes.
mesh_terms: D000328:Adult; D001194:Asbestos / Q000009:adverse effects*; D017632:Asbestos, Serpentine; D001195:Asbestosis / Q000000981:diagnostic imaging*; D006801:Humans; D008168:Lung / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D008906:Mining; D010994:Pleura / Q000000981:diagnostic imaging*; D011859:Radiography; D012907:Smoking; D013997:Time Factors
chemical_list: D017632:Asbestos, Serpentine; D001194:Asbestos