Occupational noise induced hearing loss in coal miners and coal washing factory workers in Kerman province


Sedigheh Khodabandeh Shahraki 1 , * , Sakineh Mohammadalizadeh 2 , Hakimeh Hossein Rezai 3

1 Instructor, Departments of Health Education, Kerman University of Medical Sciences, Kerman, Iran.

2 Pediatric Nursing, Kerman University of Medical Sciences, Kerman, Iran.

3 Medical & Surgical Nursing, Kerman University of Medical Sciences, Kerman, Iran.

How to Cite: Khodabandeh Shahraki S, Mohammadalizadeh S, Hossein Rezai H. Occupational noise induced hearing loss in coal miners and coal washing factory workers in Kerman province, Hormozgan Med J. 2006 ; 9(4):e90560.


Hormozgan Medical Journal: 9 (4); e90560
Published Online: January 02, 2006
Article Type: Research Article
Received: December 30, 2004
Accepted: January 02, 2006




Introduction: The occupational noise induced hearing loss is one of the wide
spread problems and a long term complication of working in noisy environments.
At the present, large groups of workers who are working in noisy environments
are exposed to hearing loss. So, this study is aimed to determine the prevalence
of hearing loss (more than, 25 dB) of the workers in coal mines and leaching
factories in Kerman state.
Methods: In this descriptive study, a sample of 150 workers from coal mines was
selected using proportional stratified random sampling method. Based on results
of first audiometry, individuals with hearing loss, history of diseases that cause
hearing loss, more than 60 years old age and less than 5 years working history in
a mine factory were excluded from the study. Data collection was performed
using a check list including some personal and job characteristics and results of
the first audiometry. In addition, audiometry was done for all of subjects. The
results were presented using descriptive statistics.
Results: Based on the audiometry results, maximum percent of hearing loss was
related to 4000 Hz frequency and then 8000 and 2000 frequencies. Totally, in
bone conduction 16% of workers were two-sided hearing handicapped. 16.7% of
the workers had right ear hearing reduction, 19.3% left ear and 8% of them had
air and bone conduction disability.
Conclusion: According to this study, the workers are seriously exposed to risk of
hearing problems due to insufficient education about hearing loss and lack of
annual audiometry. So, designing some programs in order to reduce hearing loss
should be considered.


Noise – Noise Occupational - Hearing – Hearing Loss – Noise – Induced

© 2006, Hormozgan Medical Journal. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/) which permits copy and redistribute the material just in noncommercial usages, provided the original work is properly cited.



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