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Radiographic changes in chrysotile asbestos mine and mill workers of Quebec.

Radiographic changes in 13,021 employees were assessed in 6,529 men aged 36 to 65. The prevalence of rounded small opacities (category 1/0 or more) rose with increasing dust exposure from 0.5% to 3.4%; that of irregular small opacities (category 1/0 or more), from 2.2% to 17.0%; and that of pleural thickening (grade 1 or more), from 1.4% to 12.3%. Small opacities or pleural changes were seen in 17% of men, but 3.2% had both. At present dust exposure levels, much lower rates can be expected. The prevalence of radiologic changes was higher in the Thetford Mines area than in the Asbestos area. This was shown by pleural changes more than parenchymal changes, and the difference was extreme with pleural calcification which was common in Thetford Mines but virtually absent in Asbestos.