Occupational noise and age : a longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers

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dc.contributor.author Grobler, Leoni M.
dc.contributor.author Swanepoel, De Wet
dc.contributor.author Strauss, Susan
dc.contributor.author Becker, Piet J.
dc.contributor.author Eloff, Zahan
dc.date.accessioned 2021-03-25T11:37:47Z
dc.date.available 2021-03-25T11:37:47Z
dc.date.issued 2020-03-17
dc.description.abstract BACKGROUND : A relationship exists between occupational noise exposure and age, which remains poorly understood. OBJECTIVES : The aim of this study was to establish the relationship between hearing loss and age over time. METHOD : Audiological data from 2583 mine workers in South Africa were utilised. Data were received from a non-noise exposed group (NNEG) (n = 951) and a noise exposed group (NEG) (≥85 dBA) (n = 1632). Data comprised a low-frequency average (LFA512) (average of audiological thresholds for 0.5 kHz, 1 kHz and 2 kHz) and high-frequency average (HFA346) (average of audiological thresholds for 3 kHz, 4 kHz and 6 kHz). Data were compared by using mixed-effects regression analysis. RESULTS : Base threshold values were higher for the NEG than for the NNEG across frequencies. All year-to-year increases in mean hearing thresholds were statistically significant (p < 0.01). When correcting for age, increases in mean hearing thresholds were higher for the NEG than for the NNEG for HFA346 (3.5 dB vs. 2.9 dB decline over a 4-year period) but similar for LFA512 (0.6 dB vs. 0.7 dB decline). Uncorrected for age, increases in mean hearing thresholds were higher than when age was corrected for. CONCLUSION : Age and occupational noise exposure influence hearing thresholds over time. The continued increase in hearing thresholds of the NEG above that of the NNEG can be related to ineffective noise management programmes and/or the fact that early noise exposure leads to a higher burden of hearing loss over time – even after noise exposure had stopped. en_ZA
dc.description.department Speech-Language Pathology and Audiology en_ZA
dc.description.librarian am2021 en_ZA
dc.description.sponsorship The National Institute for the Humanities and Social Sciences (NIHSS) and the Consortium for Advanced Research Training in Africa (CARTA). en_ZA
dc.description.uri http://www.sajcd.org.za en_ZA
dc.identifier.citation Grobler, L.M., Swanepoel, D.W., Strauss, S., Becker, P., & Eloff, Z. (2020). Occupational noise and age: A longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers. South African Journal of Communication Disorders, 67(2), a687. https://DOI.org/10.4102/sajcd.v67i2.687. en_ZA
dc.identifier.issn 0379-8046 (print)
dc.identifier.issn 2225-4765 (online)
dc.identifier.other 10.4102/sajcd.v67i2.687
dc.identifier.uri http://hdl.handle.net/2263/79112
dc.language.iso en en_ZA
dc.publisher AOSIS OpenJournals en_ZA
dc.rights © 2020. The Authors. Licensee: AOSIS. This work is licensed under the Creative Commons Attribution License. en_ZA
dc.subject Age-related hearing loss en_ZA
dc.subject Noise exposure en_ZA
dc.subject Noise-induced hearing loss en_ZA
dc.subject Occupational noise exposure en_ZA
dc.subject Mining en_ZA
dc.subject Non-noise exposed group (NNEG) en_ZA
dc.subject Noise exposed group (NEG) en_ZA
dc.title Occupational noise and age : a longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers en_ZA
dc.type Article en_ZA


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