지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2016.9
- 수록면
- 121 - 129 (9page)
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초록· 키워드
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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 ㏈HL 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 ㎑) during follow-up period (p ＜ 0.05). The threshold change at 4 ㎑ was 3.2 ㏈HL higher in SNHL ears which was statistically significant (p ＜ 0.05). When workers were exposed to noise levels of 85 ㏈A and above, threshold change at 4 ㎑ was 5.6 ㏈HL higher in SNHL ears which was statistically significant (p ＜ 0.05). Among workers aged below 50, the threshold change values were lower in low-frequency (0.5–2 ㎑) in SNHL ears, with a small range of changes, whereas in high-frequency (3–6 ㎑), the range of changes was greater SNHL ears (p ＜ 0.05). Among workers aged 50 and above, SNHL ears showed a wider range of changes in both high- and low-frequency areas (p ＜ 0.05).
Conclusions: At high-frequencies, particularly at 4 ㎑, 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.
Methods: Among 1819 workers at a shipyard in Ulsan, 78 subjects with an air-bone gap ≥10 ㏈HL 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 ㎑) during follow-up period (p ＜ 0.05). The threshold change at 4 ㎑ was 3.2 ㏈HL higher in SNHL ears which was statistically significant (p ＜ 0.05). When workers were exposed to noise levels of 85 ㏈A and above, threshold change at 4 ㎑ was 5.6 ㏈HL higher in SNHL ears which was statistically significant (p ＜ 0.05). Among workers aged below 50, the threshold change values were lower in low-frequency (0.5–2 ㎑) in SNHL ears, with a small range of changes, whereas in high-frequency (3–6 ㎑), the range of changes was greater SNHL ears (p ＜ 0.05). Among workers aged 50 and above, SNHL ears showed a wider range of changes in both high- and low-frequency areas (p ＜ 0.05).
Conclusions: At high-frequencies, particularly at 4 ㎑, 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.
목차
Abstract
Background
Methods
Results
Discussion
Conclusions
References
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UCI(KEPA) : I410-ECN-0101-2017-517-001364142