耳鼻と臨床
Online ISSN : 2185-1034
Print ISSN : 0447-7227
ISSN-L : 0447-7227
某製鉄所従業員の騒音強度別にみた聴覚障碍に就て
河田 政一富永 泰栄阿部 弘之
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1959 年 6 巻 1 号 p. 37-45

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The hearing disturbances of 555 workers at a steel mill were investigated, classifying the groups by noise intensity and employed years.
1) 70 db group: 54.7% of the employees working less than 5 years showed normal hearing curve and this curve decreased to only 2:4% in the employees working more than 21 years-the dip type increased to 69% and 7% showed the descending type of bad hearing curve.
2) Over 90 db group: within 5 years of employment, only 4.2% showed the normal hearing curve and the dip type was recognized in 54.2%. The employment of more than 21 years decreased the normal hearing curve into 1.8% and increased the dip type to 45.5% and the descending type to 23.6%.
As the employed years passed, hearing disturbance was caused by 70-79 db and 80-89 db noise and the progress or disturbance remained at a certain point while 90 db noise accelerated the progress of hearing disturbance.

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