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Coal workers' pneumoconiosis in the United States: regional differences 40 years after implementation of the 1969 Federal Coal Mine Health and Safety Act.
Occup Environ Med 2011; 68(12):908-13OE

Abstract

OBJECTIVE

To assess whether the recent increases in the prevalence of coal workers' pneumoconiosis (CWP) in the USA reflect increased measured exposures over recent decades, and to identify other potential causative factors.

METHODS

The observed CWP prevalence was calculated for 12,408 underground coal miner participants in the Coal Workers' Health Surveillance Program for the period 2005-2009, stratified by the Mine Safety and Health Administration (MSHA) geographical districts. The predicted prevalence was estimated using a published exposure-response model from a large epidemiological study among U.S. coal miners using dust exposure, tenure, miner's age and coal rank as predictors. χ2 Testing was performed to compare the observed versus predicted CWP prevalence.

RESULTS

Observed prevalence was significantly higher than predicted prevalence in MSHA districts 4-7 (central Appalachian region) (10.1% vs. 4.2%; prevalence ratio (PR) 2.4; p<0.001) and significantly lower than predicted in other regions (1.6% vs. 3.6%; PR 0.4; p<0.001). The central Appalachian region had a significantly older workforce with greater mining tenure, a lower proportion of mines with 200 or more employees, and lower seam heights. Significant lower average compliance dust concentrations were reported for this region.

CONCLUSION

The observed CWP prevalence substantially exceeded predicted levels in central Appalachia. However, the increased prevalence was not explained by the measured levels of dust exposures. Likely contributing factors include mine size and low seam mining, which may be associated with higher exposure to silica. Further study is needed to characterise the responsible factors for the elevated CWP rates in central Appalachia.

Authors+Show Affiliations

Epidemic Intelligence Service Program, Centers for Disease Control and Prevention, Atlanta, Georgia, USA. esuarthana@cdc.govNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

21597107

Citation

Suarthana, Eva, et al. "Coal Workers' Pneumoconiosis in the United States: Regional Differences 40 Years After Implementation of the 1969 Federal Coal Mine Health and Safety Act." Occupational and Environmental Medicine, vol. 68, no. 12, 2011, pp. 908-13.
Suarthana E, Laney AS, Storey E, et al. Coal workers' pneumoconiosis in the United States: regional differences 40 years after implementation of the 1969 Federal Coal Mine Health and Safety Act. Occup Environ Med. 2011;68(12):908-13.
Suarthana, E., Laney, A. S., Storey, E., Hale, J. M., & Attfield, M. D. (2011). Coal workers' pneumoconiosis in the United States: regional differences 40 years after implementation of the 1969 Federal Coal Mine Health and Safety Act. Occupational and Environmental Medicine, 68(12), pp. 908-13. doi:10.1136/oem.2010.063594.
Suarthana E, et al. Coal Workers' Pneumoconiosis in the United States: Regional Differences 40 Years After Implementation of the 1969 Federal Coal Mine Health and Safety Act. Occup Environ Med. 2011;68(12):908-13. PubMed PMID: 21597107.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Coal workers' pneumoconiosis in the United States: regional differences 40 years after implementation of the 1969 Federal Coal Mine Health and Safety Act. AU - Suarthana,Eva, AU - Laney,A Scott, AU - Storey,Eileen, AU - Hale,Janet M, AU - Attfield,Michael D, Y1 - 2011/05/19/ PY - 2011/5/21/entrez PY - 2011/5/21/pubmed PY - 2012/1/14/medline SP - 908 EP - 13 JF - Occupational and environmental medicine JO - Occup Environ Med VL - 68 IS - 12 N2 - OBJECTIVE: To assess whether the recent increases in the prevalence of coal workers' pneumoconiosis (CWP) in the USA reflect increased measured exposures over recent decades, and to identify other potential causative factors. METHODS: The observed CWP prevalence was calculated for 12,408 underground coal miner participants in the Coal Workers' Health Surveillance Program for the period 2005-2009, stratified by the Mine Safety and Health Administration (MSHA) geographical districts. The predicted prevalence was estimated using a published exposure-response model from a large epidemiological study among U.S. coal miners using dust exposure, tenure, miner's age and coal rank as predictors. χ2 Testing was performed to compare the observed versus predicted CWP prevalence. RESULTS: Observed prevalence was significantly higher than predicted prevalence in MSHA districts 4-7 (central Appalachian region) (10.1% vs. 4.2%; prevalence ratio (PR) 2.4; p<0.001) and significantly lower than predicted in other regions (1.6% vs. 3.6%; PR 0.4; p<0.001). The central Appalachian region had a significantly older workforce with greater mining tenure, a lower proportion of mines with 200 or more employees, and lower seam heights. Significant lower average compliance dust concentrations were reported for this region. CONCLUSION: The observed CWP prevalence substantially exceeded predicted levels in central Appalachia. However, the increased prevalence was not explained by the measured levels of dust exposures. Likely contributing factors include mine size and low seam mining, which may be associated with higher exposure to silica. Further study is needed to characterise the responsible factors for the elevated CWP rates in central Appalachia. SN - 1470-7926 UR - https://www.unboundmedicine.com/medline/citation/21597107/Coal_workers'_pneumoconiosis_in_the_United_States:_regional_differences_40_years_after_implementation_of_the_1969_Federal_Coal_Mine_Health_and_Safety_Act_ L2 - http://oem.bmj.com/cgi/pmidlookup?view=long&amp;pmid=21597107 DB - PRIME DP - Unbound Medicine ER -