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KMID : 0377619770330030281
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Korean Jungang Medical Journal
1977 Volume.33 No. 3 p.281 ~ p.287
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Studies on the Occupational Hearing Impairment from Industrial Noise
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Abstract
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Unwanted noise produces various effects in the human being through autonomic nervous system. Disturbed peripheral circulation,. elevation of blood pressure, metabolic and humoral changes, sleep disturbance, enhancement of fatigue, lowering of work-efficiency and other psychopathologic changes are known to be caused by noise.
Sensory-neural hearing impairment is seen as C;-dip mainly in the range of 4 KHz which is above the range of the conversational frequencies. Therefore early detection of noise induced hearing impairment is difficult.
The present study was performed at the six major industrial factories in the Kyung-In (Seoul and Inchon) areas. Analysis of environmental noise and audiometric survey was done among 1,970 workers and analyzed according to the types of the industry.
The result obtained was as follows:
1. The workers were composed of 1, 326 men and 644 females. Female workers were mostly of textile industry whereas machinery and steel industries comprised most male workers.
2. Average age was high (34.7 years) among the machinery and steel workers and lowest (22.2 years) was textile workers.
3. Average duration of employment was high (5.5±4.7 years) among the machinery and steel industries and low (2.4±1.7 years) among the textile industry.
4. Hearing impairment was higher among the machinery and steel industries in the separate ears (Rt. 42.3±19.6) (Lt. 42.9±20. 1). Average hearing impairment was also higher among the machinery and steel workers (Rt. 9.9±13.6) (Lt. 10.7±15.3). No significant changes were found between
right and the left ear.
5. Relation between duration-of employment and hearing impairment apply mg
Early Loss Index (ELI) was significantly parallel with increased D and E. 6. Pure rate of noise-induced hearing impairment applying ELI was 29% and
31% in the right and the left ear respectively.
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