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KMID : 1039220150250040573
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Journal of Korean Society of Occupational and Environmental Hygiene
2015 Volume.25 No. 4 p.573 ~ p.583
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For 5-years the Longitudinal Study on the Effect of Noise Exposure and Aging to the Changes of Hearing Threshold Level
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Chae Chang-Ho
Kim Ja-Hyeon
Son Jun-Seok
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Abstract
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Objectives: This study was carried out to evaluate the effect of noise exposure and aging on changes in hearing threshold level and the relationship between age and noise.
Materials: The author selected 274 male shipyard and assembly line workers as the noise exposed group and 582 males not exposed to noise as the general population group. Data were collected from five years of consecutive annual audiometric tests performed from 2008 to 2012.
Results: In the general population and noise exposed groups, there was a reverse phenomenon that hearing threshold level for 2009 was lower than that of 2008, which seemed to be due to the learning effect, but from 2010 hearing threshold level increased. In the noise exposed group, the mean hearing threshold level in the left ear was significantly higher than that for right ear. In the general population group, the older was the age, the higher was the hearing threshold level, especially at 4000 Hz. In the general population and noise exposed groups, frequency, age group and noise exposure independently affected hearing threshold level, and there was no relationship between age and noise exposure. Over all frequencies, the change of hearing threshold level was larger in the noise exposed group than in the general population group. In the noise exposed group below thirty years old, the change at 4000 Hz was remarkable.
Conclusions: Age and noise exposure seem to affect hearing threshold level independently and contribute to an additive effect on hearing threshold level.
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KEYWORD
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aging effect, hearing threshold level, noise exposure
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