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Respirable coal dust exposure and respiratory symptoms in South-African coal miners: a comparison of current and ex-miners.
J Occup Environ Med. 2006 Jun; 48(6):581-90.JO

Abstract

OBJECTIVES

Dose-response associations between respirable dust exposure and respiratory symptoms and between symptoms and spirometry outcomes among currently employed and formerly employed South-African coal miners were investigated.

METHODS

Work histories, interviews, and spirometry and cumulative exposure were assessed among 684 current and 212 ex-miners.

RESULTS

Lower prevalences of symptoms were found among employed compared with ex-miners. Associations with increasing exposure for symptoms of phlegm and past history of tuberculosis were observed, whereas other symptom prevalences were higher in the higher exposure categories. Symptomatic ex-miners exhibited lower lung function compared to the nonsymptomatic.

CONCLUSIONS

Compared with published data, symptoms rates were low in current miners but high in ex-miners. Although explanations could include the low prevalence of smoking and/or reporting/selection bias, a "survivor" and/or a "hire" effect is more likely, resulting in an underestimation of the dust-related effect.

Authors+Show Affiliations

Centre for Occupational and Environmental Health, University of KwaZulu-Natal, Congella, South Africa. naidoon@ukzn.ac.zaNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Multicenter Study
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16766922

Citation

Naidoo, Rajen N., et al. "Respirable Coal Dust Exposure and Respiratory Symptoms in South-African Coal Miners: a Comparison of Current and Ex-miners." Journal of Occupational and Environmental Medicine, vol. 48, no. 6, 2006, pp. 581-90.
Naidoo RN, Robins TG, Seixas N, et al. Respirable coal dust exposure and respiratory symptoms in South-African coal miners: a comparison of current and ex-miners. J Occup Environ Med. 2006;48(6):581-90.
Naidoo, R. N., Robins, T. G., Seixas, N., Lalloo, U. G., & Becklake, M. (2006). Respirable coal dust exposure and respiratory symptoms in South-African coal miners: a comparison of current and ex-miners. Journal of Occupational and Environmental Medicine, 48(6), 581-90.
Naidoo RN, et al. Respirable Coal Dust Exposure and Respiratory Symptoms in South-African Coal Miners: a Comparison of Current and Ex-miners. J Occup Environ Med. 2006;48(6):581-90. PubMed PMID: 16766922.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Respirable coal dust exposure and respiratory symptoms in South-African coal miners: a comparison of current and ex-miners. AU - Naidoo,Rajen N, AU - Robins,Thomas G, AU - Seixas,Noah, AU - Lalloo,Umesh G, AU - Becklake,Margaret, PY - 2006/6/13/pubmed PY - 2006/11/1/medline PY - 2006/6/13/entrez SP - 581 EP - 90 JF - Journal of occupational and environmental medicine JO - J. Occup. Environ. Med. VL - 48 IS - 6 N2 - OBJECTIVES: Dose-response associations between respirable dust exposure and respiratory symptoms and between symptoms and spirometry outcomes among currently employed and formerly employed South-African coal miners were investigated. METHODS: Work histories, interviews, and spirometry and cumulative exposure were assessed among 684 current and 212 ex-miners. RESULTS: Lower prevalences of symptoms were found among employed compared with ex-miners. Associations with increasing exposure for symptoms of phlegm and past history of tuberculosis were observed, whereas other symptom prevalences were higher in the higher exposure categories. Symptomatic ex-miners exhibited lower lung function compared to the nonsymptomatic. CONCLUSIONS: Compared with published data, symptoms rates were low in current miners but high in ex-miners. Although explanations could include the low prevalence of smoking and/or reporting/selection bias, a "survivor" and/or a "hire" effect is more likely, resulting in an underestimation of the dust-related effect. SN - 1076-2752 UR - https://www.unboundmedicine.com/medline/citation/16766922/Respirable_coal_dust_exposure_and_respiratory_symptoms_in_South_African_coal_miners:_a_comparison_of_current_and_ex_miners_ L2 - http://dx.doi.org/10.1097/01.jom.0000200875.99411.03 DB - PRIME DP - Unbound Medicine ER -