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Cross-shift peak expiratory flow changes are unassociated with respirable coal dust exposure among South African coal miners.
Am J Ind Med. 2007 Dec; 50(12):992-8.AJ

Abstract

BACKGROUND

The objectives of this study were to determine whether cross-shift changes in peak expiratory flow rate (PEFR) were related to respirable dust exposure in South African coalminers.

METHODS

Fifty workers were randomly selected from a cohort of 684 miners from 3 bituminous coalmines in Mpumalanga, South Africa. Peak expiratory efforts were measured prior to the commencement of the shift, and at the end of the shift on at least two occasions separated by at least 2 weeks, with full shift personal dust sampling being conducted on each occasion for each participant. Interviews were conducted, work histories were obtained and cumulative exposure estimates were constructed. Regression models examined the associations of cross-shift changes in PEFR with current and cumulative exposure, controlling for shift, smoking and past history of tuberculosis.

RESULTS

There were marginal differences in cross-shift PEFR (ranging from 0.1 to 2 L/min). Linear regression analyses showed no association between cross-shift change in PEFR and current or cumulative exposure. The specific shift worked by participants in the study showed no effect.

CONCLUSIONS

Our study showed no association between current respirable dust exposure and cross-shift changes in PEFR. There was a non-significant protective effect of cumulative dust exposure on the outcome, suggesting the presence of a "healthy worker survivor effect" in this data.

Authors+Show Affiliations

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

Pub Type(s)

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

Language

eng

PubMed ID

17918230

Citation

Naidoo, Rajen N., et al. "Cross-shift Peak Expiratory Flow Changes Are Unassociated With Respirable Coal Dust Exposure Among South African Coal Miners." American Journal of Industrial Medicine, vol. 50, no. 12, 2007, pp. 992-8.
Naidoo RN, Robins TG, Becklake M, et al. Cross-shift peak expiratory flow changes are unassociated with respirable coal dust exposure among South African coal miners. Am J Ind Med. 2007;50(12):992-8.
Naidoo, R. N., Robins, T. G., Becklake, M., Seixas, N., & Thompson, M. L. (2007). Cross-shift peak expiratory flow changes are unassociated with respirable coal dust exposure among South African coal miners. American Journal of Industrial Medicine, 50(12), 992-8.
Naidoo RN, et al. Cross-shift Peak Expiratory Flow Changes Are Unassociated With Respirable Coal Dust Exposure Among South African Coal Miners. Am J Ind Med. 2007;50(12):992-8. PubMed PMID: 17918230.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cross-shift peak expiratory flow changes are unassociated with respirable coal dust exposure among South African coal miners. AU - Naidoo,Rajen N, AU - Robins,Thomas G, AU - Becklake,Margaret, AU - Seixas,Noah, AU - Thompson,Mary Lou, PY - 2007/10/6/pubmed PY - 2008/2/21/medline PY - 2007/10/6/entrez SP - 992 EP - 8 JF - American journal of industrial medicine JO - Am. J. Ind. Med. VL - 50 IS - 12 N2 - BACKGROUND: The objectives of this study were to determine whether cross-shift changes in peak expiratory flow rate (PEFR) were related to respirable dust exposure in South African coalminers. METHODS: Fifty workers were randomly selected from a cohort of 684 miners from 3 bituminous coalmines in Mpumalanga, South Africa. Peak expiratory efforts were measured prior to the commencement of the shift, and at the end of the shift on at least two occasions separated by at least 2 weeks, with full shift personal dust sampling being conducted on each occasion for each participant. Interviews were conducted, work histories were obtained and cumulative exposure estimates were constructed. Regression models examined the associations of cross-shift changes in PEFR with current and cumulative exposure, controlling for shift, smoking and past history of tuberculosis. RESULTS: There were marginal differences in cross-shift PEFR (ranging from 0.1 to 2 L/min). Linear regression analyses showed no association between cross-shift change in PEFR and current or cumulative exposure. The specific shift worked by participants in the study showed no effect. CONCLUSIONS: Our study showed no association between current respirable dust exposure and cross-shift changes in PEFR. There was a non-significant protective effect of cumulative dust exposure on the outcome, suggesting the presence of a "healthy worker survivor effect" in this data. SN - 0271-3586 UR - https://www.unboundmedicine.com/medline/citation/17918230/Cross_shift_peak_expiratory_flow_changes_are_unassociated_with_respirable_coal_dust_exposure_among_South_African_coal_miners_ L2 - https://doi.org/10.1002/ajim.20513 DB - PRIME DP - Unbound Medicine ER -