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Follow-up study of chrysotile textile workers: cohort mortality and exposure-response.

Authors
Hein-MJ; Stayner-LT; Lehman-E; Dement-JM
Source
Occup Environ Med 2007 Sep; 64(9):616-625
NIOSHTIC No.
20032483
Abstract
Objectives: This report provides an update of the mortality experience of a cohort of South Carolina asbestos textile workers. Methods: A cohort of 3072 workers exposed to chrysotile in a South Carolina asbestos textile plant (1916-77) was followed up for mortality through 2001. Standardised mortality ratios (SMRs) were computed using US and South Carolina mortality rates. A job exposure matrix provided calendar time dependent estimates of chrysotile exposure concentrations. Poisson regression models were fitted for lung cancer and asbestosis. Covariates considered included sex, race, age, calendar time, birth cohort and time since first exposure. Cumulative exposure lags of 5 and 10 years were considered by disregarding exposure in the most recent 5 and 10 years, respectively. Results: A majority of the cohort was deceased (64%) and 702 of the 1961 deaths occurred since the previous update. Mortality was elevated based on US referent rates for a priori causes of interest including all causes combined (SMR 1.33, 95% CI 1.28 to 1.39); all cancers (SMR 1.27, 95% CI 1.16 to 1.39); oesophageal cancer (SMR 1.87, 95% CI 1.09 to 2.99); lung cancer (SMR 1.95, 95% CI 1.68 to 2.24); ischaemic heart disease (SMR 1.20, 95% CI 1.10 to 1.32); and pneumoconiosis and other respiratory diseases (SMR 4.81, 95% CI 3.84 to 5.94). Mortality remained elevated for these causes when South Carolina referent rates were used. Three cases of mesothelioma were observed among cohort members. Exposure-response modelling for lung cancer, using a linear relative risk model, produced a slope coefficient of 0.0198 (fibre-years/ml) (standard error 0.00496), when cumulative exposure was lagged 10 years. Poisson regression modelling confirmed significant positive relations between estimated chrysotile exposure and lung cancer and asbestosis mortality observed in previous updates of this cohort. Conclusions: This study confirms the findings from previous investigations of excess mortality from lung cancer and asbestosis and a strong exposure-response relation between estimated exposure to chrysotile and mortality from lung cancer and asbestosis.
Keywords
Asbestos-industry; Asbestos-dust; Asbestos-workers; Asbestosis; Textiles-industry; Textile-workers; Textile-mills; Mortality-data; Mortality-rates; Mortality-surveys; Epidemiology; Statistical-analysis; Lung-cancer; Respiratory-system-disorders; Pulmonary-system-disorders
Contact
Ms M J Hein, Industrywide Studies Branch, Division of Surveillance, Hazard Evaluations and Field Studies, National Institute for Occupational Safety and Health, Cincinnati, Ohio 45226, USA
CODEN
OEMEEM
CAS No.
12001-29-5; 1332-21-4
Publication Date
20070901
Document Type
Journal Article
Email Address
MHein@cdc.gov
Fiscal Year
2007
NTIS Accession No.
NTIS Price
Issue of Publication
9
ISSN
1351-0711
NIOSH Division
DSHEFS; EID
Source Name
Occupational and Environmental Medicine
State
OH; IL; NC
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