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KMID : 0378019910340020056
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New Medical Journal
1991 Volume.34 No. 2 p.56 ~ p.64
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Results of the Audiometric Tests Performed in Workers of an Iron Foundry
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Abstract
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This study includes 309 noise-exposed subjects who worked at an iron foundry and were selected as having hearing loss from the screening hearing test. The detailed audiometric tests were performed and the data were analyzed as follows
1) Among 309 subjects, there were 231 subjects(74.4%) diagnosed as mild hearing loss and ranked as "C", and 32 subjects(10.4%) diagnosed as noise-induced hearing loss ranked as "D1", so called occupational illness. 46 subjects(14.9%) ranked as "D2" had hearing loss due to general ear disease. Thus 263 subjects showed as having noise induced hearing loss and it occupies 18.2% of all 1.442 workers.
2) The distribution according to the degree of hearing loss showed as mild hearing loss (26-40dB) in 185 subjects(59.9%) "Vf" or right ear and 192 subjects(62.2%) for left ear. 42 (13.6%) subjects for right ear and 74 subjects(23.9%) for left ear had hearing loss more than 41dB. After the subjects ranked as "D2" were excluded, mild hearing loss were observed in 172 subject (65.4%) for right ear and in 191 subjects (72.6%) for left ear. And hearing loss more than 41dB for right ear were in 19 subjects(7.2%) and for left ear 40 subjects(15.2%).
3) Degree of hearing impairment in left ear was more severe than in right ear.
4) The group of age older than 35 years was more affected in hearing impairment than in the one younger than 35 years.
5) Subjects with longer than 10 year-exposure were induced more hearing loss than in subjects with the duration of exposure less than 10 years.
6) No significant difference was found between the two groups whose military services were waived or, not, and also between groups whose military services were in the infantry or in the artillery.
7) Subjects having tinnitus showed more hearing impairment than the one without tinnitus.
8) Duration of exposure or age didn´t affect significantly the distribution of hearing loss more than 41dB.
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