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Korean Journal of Otorhinolaryngology-Head and Neck Surgery > Volume 10(1); 1967 > Article
Korean Journal of Otorhinolaryngology-Head and Neck Surgery 1967;10(1): 1-8.
Clinical Analysis on C<sub>5</sub> dip in Coal Mine Workers
Sang Yong Park, MD (Director : Prof. Hong Kee Kim, MD, PhD)
Department of Otolaryngology, College of Medicine, Seoul National University, Korea
C<sub>5</sub> dip를 나타내는 炭鑛從業員에 對한 臨床統計的考察
朴祥用 (指導 : 金弘基 敎授)
서울大學校 大學院 醫學科 耳鼻咽喉科學敎室
ABSTRACT

The hearing tests were made on 4372 persons working under noise in a coal mine to investigate and analyze the relationships among the rates of occurrence of C5 dip and the changes of age, the number of working years, and the noise intensity in the working places. The results were as follows : 1) C5 dip was found in 411 persons (9.4%) of 4372 workers. 2) The older the age, the higher the rate of occurrence showed the increasing tendency. 3) The longer the number of working years, the higher the rate of occurrence showed the increasing tendency. 4) The grade of C5 dip had a tendency to vary from slight to worse in proportion to number of working years and the changes of age. 5) The distribution of high grade C5 dip and low grade was nearly pararell each other in the age group, but was not in the group years service. 6) The occurrence rate and the changes of grade were highly related to the age than the number of working years. 7) The rate of occurrence of C5 dip was remarkably related to the noise intensity of the working places in the group kind of service.

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