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American Journal of Epidemiology Vol. 126, No. 5: 893-900
Copyright © 1987 by The Johns Hopkins University School of Hygiene and Public Health

research-article

US PREVALENCE OF OCCUPATIONAL PLEURAL THICKENING A LOOK AT CHEST X-RAYS FROM THE FIRST NATIONAL HEALTH AND NUTRITION EXAMINATION SURVEY

WALTER J. ROGAN1,, BETH C. GLADEN2, N. BETH RAGAN3 and HENRY A. ANDERSON4

1Epidemio1ogy Branch, National Institute of Environmental Health Sciences Research Triangle Park, NC
2Staticstics and Biomathematics Branch, National Institute of Environmental Health Sciences Research Triangle Park, NC
3Computer Sciences Corporation Research Triangle Park, NC
4Environmental and Chronic Disease Epidemiology, Wisconsin Department of Health and Social Ser vices Madison, WL

Reprint requests to Dr. Walter J. Rogan, NIEHS, Mail Drop A3-02, POB 12233, Research Triangle Park, NC 27709

The prevalence of occupational pleural thickening in the United States in the mid-1970s was estimated; since asbestos often produces pleural thickening, this estimate In turn was used to estimate the prevalence of asbestos exposure. Chest z-rays obtained by the 1971–1975 National Health and Nutrition Examina lion Survey were reread by three readers usIng the International Labour Office criteria for diagnosis of pleural thickening consistent with dust exposure. All 289 x-rays showing any pleural abnormalities plus a 3-to-1 age-, sex-, and racematched control series were reread. Using two of three readings as "positive", and extrapolating to the US population from this defined sample, the authors showed that 2.3% of males and 0.2% of females had occupational pleural thickening on x-ray, with a strong Increase with age in white males. This provides a US population estimate of 1.3 million people with occupational pleural thickening and approximately 8 million people with asbestos exposure In the mld-1970s. This cohort might make a substantial contribution to cancer mortality into the next century.

asbestos; pleural diseases; pneumoconiosls; population


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