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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
| Content Provider | Semantic Scholar |
|---|---|
| Author | Park, Sang Jin Sung, Joo Hyun Sim, Chang Sun Yun, Seok Hyeon Yeom, Jeong Han Kwon, Joong-Keun Lee, Jiho |
| Copyright Year | 2016 |
| Abstract | BackgroundThe 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.MethodsAmong 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.ResultsThe 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 < 0.05). The threshold change at 4 kHz was 3.2 dBHL higher in SNHL ears which was statistically significant (p < 0.05). When workers were exposed to noise levels of 85 dBA and above, threshold change at 4 kHz was 5.6 dBHL 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 kHz) in SNHL ears, with a small range of changes, whereas in high-frequency (3–6 kHz), 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).ConclusionsAt 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. |
| Starting Page | 214 |
| Ending Page | 215 |
| Page Count | 2 |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://aoemj.biomedcentral.com/track/pdf/10.1186/s40557-016-0132-1 |
| PubMed reference number | 27688888v1 |
| Alternate Webpage(s) | https://doi.org/10.1186/s40557-016-0132-1 |
| DOI | 10.1186/s40557-016-0132-1 |
| Journal | Annals of Occupational and Environmental Medicine |
| Volume Number | 28 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Biochemistry Bone Tissue Conductive hearing loss EPRS gene Ear structure Follow-Up Report Kilohertz Noise-induced hearing loss Physical Examination Retrospective Cohort Study Sensorineural Hearing Loss (disorder) hearing impairment t test |
| Content Type | Text |
| Resource Type | Article |
