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Asbestos-related disease in a group of 153 plumbers and pipefitters
employed in building construction was assessed by means of
cross-sectional prevalence study. Study methods were (1) medical
questionnaire, (2) spirometry, (3) measurement of diffusing capacity,
(4) physical examination of the chest, and (5) chest roentgenogram. The
major finding was bilateral pleural thickening in 28 (18.3%) of the participants. Unilateral pleural thickening was
found in 12 subjects(7.8%). Small irregular opacities of profusion 1/0
or greater were found in 12 subjects (7.8%). Bilateral pleural
thickening was associated with both age and time since first asbestos
exposure, while unilateral pleural thickening was associated with
duration of exposure. The most prevalent abnormality found was
bilateral pleural thickening which is more specific for asbestos
exposure than is unilateral pleural thickening.