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KMID : 1041720160280010051
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Annals of Occupational and Environmental Medicine
2016 Volume.28 No. 1 p.51 ~ p.51
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Comparisons of hearing threshold changes in male workers with unilateral conductive hearing loss exposed to workplace noise: a retrospective cohort study for 8 years
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Park Sang-Jin
Sung Joo-Hyun
Sim Chang-Sun
Yun Seok-Hyeon
Yeom Jeong-Han
Kwon Joong-Keun
Lee Ji-Ho
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Abstract
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Background: The purpose of this study was to investigate hearing threshold changes of workers with unilateral conductive hearing loss who were exposed to workplace noise for 8-years.
Methods: Among 1819 workers at a shipyard in Ulsan, 78 subjects with an air-bone gap ≥10 dBHL in unilateral ears were selected. Factors that could affect hearing were acquired from questionnaires, physical examinations, and biochemistry examinations. Paired t-test was conducted to compare the hearing threshold changes over time between conductive hearing loss (CHL) ear and sensorineural hearing loss (SNHL) ear.
Results: The study included male subjects aged 48.7?±?2.9, having worked for 29.8?±?2.7 years. Hearing thresholds increased significantly in CHL ears and SNHL ears at all frequencies (0.5?6 kHz) during follow-up period (p?
Conclusions: At high-frequencies, particularly at 4 kHz, the range of hearing threshold changes was lower in ears with conductive hearing loss than in contralateral ears. This is suggested as a protective effect against noise exposure.
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KEYWORD
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Conductive hearing loss, Noise-induced hearing loss, Noise, Retrospective cohort study
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