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coal workers' pneumoconiosis to type of radiographic opacity. From a group of 1 461 working coal miners who participated in an epidemiological study, 223 men with simple pneumoconiosis were selected on the basis of the type of small rounded opacity noted to be present in their chest films. No differences in spirometry or lung volumes were found between those with the micronodular (q) and those with pinhead (p) opacities. Twenty-five non-smoking miners with category 2 or 3 simple coaldoi:10.1136/oem.29.1.50 fatcat:xck3gtwk5fcsvh7rc4ibllwipy