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Korean Journal of Otorhinolaryngology-Head and Neck Surgery > Volume 37(6); 1994 > Article
Korean Journal of Otorhinolaryngology-Head and Neck Surgery 1994;37(6): 1148-54.
An Analysis of Audiologic Tests in Coal Miners with Noise Induced Hearing Loss
Dong Hak Jung, MD, Byoung Moon Yoon, MD, Jeong Pyo Bong, MD, Jong Chan Hong, MD, Woon Woo Lee, MD, and Won Young Lee, MD
Department of Otolaryngology, Yonsei University, Wonju College of Medicine, Wonju, Korea
소음성 난청을 가진 탄광광부들의 청각검사 결과 분석
정동학 · 윤병문 · 봉정표 · 홍종찬 · 이운우 · 이원영
연세대학교 원주의과대학 이비인후과학교실

Like presbycusis the, noise induced hearing loss(NIHL) cannot be undone, but unlike presbycusis, it can be prevented or at least minimized with reasonable precautions and protections against noise exposure are taken. The noise induced hearing loss appears in various patterns on pure tone audiogram(PTA). In diagnosis of NIHL, therefore, it is important to estimate not only the patterns of hearing loss on PTA but also past history of exposure to noise. We performed audiologic evaluation for 226 selected patients in 381 retired coal miners. The following results were obtained : 1) The mean working duration was 17 years and average hearing loss was 43dB. 2) There was a significant difference in hearing loss between the group of less than 5 years and the groups of more than 5 years in duration. 3) There was no significant difference in hearing loss according to initial age. 4) The most common type of audiogram was type II(abrupt drop). 5) Patterns of hearing loss showed shifting from type I to type III or IV according to the increase of working duration. 

Keywords: Noise induced hearing lossCoal miners.
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