Hearing profile of gold miners with and without tuberculosis

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dc.contributor.author Brits, Janet
dc.contributor.author Strauss, Susan
dc.contributor.author Eloff, Zahan
dc.contributor.author Becker, Piet J.
dc.contributor.author Swanepoel, De Wet
dc.date.accessioned 2012-05-23T06:08:59Z
dc.date.available 2012-05-23T06:08:59Z
dc.date.issued 2012-04
dc.description.abstract OBJECTIVES : To compare the hearing of gold miners with and without tuberculosis (TB) to determine the effect of TB and its associated risk profile on hearing. METHODS : Audiological and medical surveillance data of 2698 South African gold miners for 2001-2009 were analysed in a retrospective cohort design. Hearing thresholds for the air conduction frequencies (0.5, 1, 2, 3, 4, 6, 8 kHz) in both ears were analysed together with biographical and occupational data. Subjects were divided into two experimental (single TB treatment, n=911 and multiple TB treatment, n=376) and one control group (n=1411). Comparisons between groups included (1) change from baseline to most recent audiogram, (2) most recent hearing thresholds and (3) most recent thresholds in a subset of noise exposed and unexposed groups. RESULTS : Hearing thresholds for the TB groups were significantly (p<0.01) elevated compared to the control group, after correcting for time between baseline and most recent audiogram, threshold at baseline and age at test. Pair-wise comparisons demonstrated the largest threshold differences between the control and multiple TB group. Changes in mean thresholds across TB treatment groups were independent of noise exposure. Hearing thresholds over time also deteriorated significantly more (p<0.01) in workers with TB (single and multiple treatment) than in workers without TB. CONCLUSION : Gold miners with TB, especially with more than one episode of TB, demonstrate significantly poorer hearing thresholds and more pronounced decline in hearing over time independent of noise exposure. The exact cause is likely a complex interaction between TB, including treatment, and its associated risk profile. en
dc.description.librarian nf2012 en
dc.description.uri http://oem.bmj.com/ en_US
dc.identifier.citation Brits, J, Strauss, S, Eloff, Z, Becker, PJ & Swanepoel, DW 2012, ' Hearing profile of gold miners with and without tuberculosis', Occupational and Environmental Medicine, vol. 69, no. 4, pp. 243-249. en
dc.identifier.issn 1351-0711 (print)
dc.identifier.issn 1470-7926 (online)
dc.identifier.other 10.1136/oemed-2011-100106
dc.identifier.uri http://hdl.handle.net/2263/18820
dc.language.iso en en_US
dc.publisher BMJ Publishing Group en_US
dc.rights © 2012 by the BMJ Publishing Group Ltd. All rights reserved. en_US
dc.subject Noise-induced hearing loss (NIHL) en
dc.subject.lcsh Gold miners -- Diseases en
dc.subject.lcsh Tuberculosis -- Complications en
dc.subject.lcsh Deafness, Noise induced en
dc.title Hearing profile of gold miners with and without tuberculosis en
dc.type Postprint Article en


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