초록

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Abstract ▼ AI-Helper

Audiological evaluation was performed for 184 female weavers (351 ears), who were 18~25 years old and have been working under exposure of 103~105 ㏈a of machinary noise. With the duration of employment, they were divided into five groups; under 1 year, 1~2 years, 2~3 years, 3~4 years and over ...

Audiological evaluation was performed for 184 female weavers (351 ears), who were 18~25 years old and have been working under exposure of 103~105 ㏈a of machinary noise. With the duration of employment, they were divided into five groups; under 1 year, 1~2 years, 2~3 years, 3~4 years and over 4 years. The following results were obtained: 1. The incidence ;of noise induced hearing loss was 39.7% (36.2% of ears) and rapidly increased during first 1~2 years. 2. The average maximum hearing loss on the pure tone audiograms appeared at 4,000Hz with .about 40 ㏈ of hearing level. The average hearing level at high frequencies(3,000Hz~8,000Hz) showed below 25㏈ of hearing level in all groups and had the tendency to increase slightly with the duration of working, but the most of hearing losses developed during first one year except at 8,000Hz. 3. The average hearing level at speech frequencies was within normal range but the cases of hearing level over 25 ㏈ at 2,000Hz was 27.1%. 4. The cases with maximum hearing loss at 4,000Hz were 72.7%, but the cases of maximum hearing loss at the other frequencies (3,000Hz, 6,000Hz .and 8,000Hz) were also observed and they increased slightly in numbers with the duration of working. The noise induced hearing loss under the exposure of 103~105㏈a for 5 years, seemed to develope during first 1~2 years and there after slightly .increased hearing loss was showed but no remarkable changes were observed.