Occupational noise and age: A longitudinal study of hearing sensitivity as a function of noise exposure and age in South African gold mine workers.
Adult
Age Factors
Audiometry
/ statistics & numerical data
Case-Control Studies
Female
Gold
Hearing Loss, Noise-Induced
/ epidemiology
Humans
Longitudinal Studies
Male
Middle Aged
Miners
/ statistics & numerical data
Noise, Occupational
/ adverse effects
Occupational Diseases
/ epidemiology
Retrospective Studies
South Africa
/ epidemiology
Age-related hearing loss
Mining
Noise exposure
Noise-induced hearing loss
Occupational noise exposure
Journal
The South African journal of communication disorders = Die Suid-Afrikaanse tydskrif vir Kommunikasieafwykings
ISSN: 2225-4765
Titre abrégé: S Afr J Commun Disord
Pays: South Africa
ID NLM: 7805099
Informations de publication
Date de publication:
17 03 2020
17 03 2020
Historique:
received:
23
10
2019
accepted:
21
01
2020
revised:
12
01
2020
entrez:
4
4
2020
pubmed:
4
4
2020
medline:
15
12
2020
Statut:
epublish
Résumé
A relationship exists between occupational noise exposure and age, which remains poorly understood. The aim of this study was to establish the relationship between hearing loss and age over time. 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. 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. 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.
Sections du résumé
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.
Identifiants
pubmed: 32242440
doi: 10.4102/sajcd.v67i2.687
pmc: PMC7136817
doi:
Substances chimiques
Gold
7440-57-5
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e1-e7Commentaires et corrections
Type : ErratumIn
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