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Risk of silicosis in a Colorado mining community.

Authors
Kreiss-K; Zhen-B
Source
Am J Ind Med 1996 Nov; 30(5):529-539
NIOSHTIC No.
00233761
Abstract
The associations between cumulative dust and silica (14808607) exposures and silicosis were examined in this community based study. One hundred miners and 34 community residents (controls) living in a mining town in Colorado participated in the investigation. Silica exposure data and occupational histories were used to evaluate the silica exposure level of each individual. While none of the controls had an abnormal chest radiograph, 32% of the exposed workers were diagnosed with silicosis, based on the radiographs. Within the exposed group, those with silicosis tended to be older than those without silicosis. The prevalence of silicosis increased with increasing years of exposure. While 15.4% of the miners exposed for less than 20 years developed silicosis, 47.1% of the miners exposed for over 30 years developed the disease. The prevalence of silicosis also increased with increasing exposure level. Workers exposed to dust levels of 0.4mg/m3 or less had a silicosis rate of 10%, while those exposed to dust levels greater than 0.8mg/m3 had a significantly higher silicosis rate of 48.6%. Likewise, increasing dust or silica cumulative exposure resulted in increased incidences of silicosis. Risk assessment based on cumulative silica exposure produced higher rates than that based on cumulative dust exposure. More than 2mg/m3 years of cumulative silica exposure resulted in a silicosis rate of 62.5%. The authors conclude that, although silica exposure levels were below the permissible exposure limits in this occupational situation, silicosis occurred at a high rate among the miners of this community.
Keywords
NIOSH-Publication; NIOSH-Grant; Humans; Occupational-exposure; Long-term-exposure; Dust-exposure; Silica-dusts; Respiratory-system-disorders; Chest-X-rays; Mine-workers
Contact
Medicine National Jewish Hosp/res Ctr 3800 East Colfax Avenue Denver, Colo 80206
CODEN
AJIMD8
CAS No.
14808-60-7
Publication Date
19961101
Document Type
Journal Article
Funding Amount
98928.00
Funding Type
Grant
Fiscal Year
1997
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-00018
Issue of Publication
5
ISSN
0271-3586
Priority Area
Respiratory-system-disorders
Source Name
American Journal of Industrial Medicine
State
CO
Performing Organization
National Jewish Ctr for Immnlgy/resp Med, Denver, Colorado
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