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Vermiculite, respiratory disease and asbestos exposure in Libby, Montana: update of a cohort mortality study.

Authors
Sullivan-PA
Source
Environ Health Perspect 2007 Apr; 115(4):579-585
NIOSHTIC No.
20031410
Abstract
Background. Vermiculite from the mine near Libby, Montana, is contaminated with tremolite asbestos and other amphibole fibers (winchite and richterite). Asbestos-contaminated Libby vermiculite was used in loose-fill attic insulation that remains in millions of homes in the U.S., Canada, and other countries. Objective. This report describes asbestos-related occupational respiratory disease mortality among workers who mined, milled, and processed the Libby vermiculite. Methods. This historical cohort mortality study uses life table analysis methods to compare the age-adjusted mortality experience through 2001 of 1,672 Libby workers to that of white men in the U.S. population. Results. Libby workers were significantly more likely to die from asbestosis (standardized mortality ratio [SMR] 165.8; 95% confidence interval [CI] 103.9, 251.1), lung cancer (SMR 1.7; 95% CI 1.4, 2.1), cancer of the pleura (SMR 23.3; 95% CI 6.3, 59.5), and mesothelioma. Mortality from asbestosis and lung cancer increased with increasing duration and cumulative exposure to airborne tremolite asbestos and other amphibole fibers. Conclusions. The observed dose-related increases in asbestosis and lung cancer mortality highlight the need for better understanding and control of exposures that may occur when homeowners or construction workers (including plumbers, cable installers, electricians, telephone repair personnel, and insulators) disturb loose-fill attic insulation made with asbestoscontaminated vermiculite from Libby, Montana.
Keywords
Asbestos-industry; Asbestos-mining; Asbestos-workers; Asbestosis; Respiratory-system-disorders; Pulmonary-system-disorders; Lung-disease; Environmental-exposure; Disease-incidence; Dose-response; Cancer; Cancer-rates; Mortality-data; Mortality-rates; Region-8
Contact
P.A. Sullivan, Sc.D., National Institute for Occupational Safety and Health, Division of Respiratory Disease Studies, 1095 Willowdale Road, Morgantown, WV 26505
CODEN
EVHPAZ
CAS No.
1332-21-4
Publication Date
20070401
Document Type
Journal Article
Email Address
PSullivan@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0091-6765
NIOSH Division
DRDS
Source Name
Environmental Health Perspectives
State
MT; WV
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