Clinical Study of Noise-induced Deafness

PART 15: Statistics of Cases Recognized as Eligible for Worker's Accident Conpensation Insurance for Noise-induced Deafness

Abstract

Of 2, 396 cases recognized as eligible for Worker's Accident Compensation Insurance for noise-induced deafness at the Kanto Rosai Hospital in the past 25 years, 2, 168 cases who received medical examination during 11 years from 1979 to 1990 were studied as to the age distribution at the time of recognition, number of years worked under noisy workshop and grade of impairment (rank of compensation). The results obtained are as follows.
1. As for the age at the time of recognition 96% of the total persons were in their 50s and 60s. The increase and decrease in the number of cases recognized during one year was related to the number of recognized cases in their 50s.
2. As for the number of years worked under noisy workshop, the proportion of years worked for 30 years or less that accounted for 61% decreased slowly, and on the whole, 31 to 40 years worked accouted for 78%.
3. As for the grade of impairment, cases with rank 10 or above accoused for 60% or more up to 1981, but the majority cases were mild after 1982.