1994 Volume 37 Issue 6 Pages 726-731
More than four years have past since a screening audiometry using 1kHz and 4kHz was made mandatory in general health examination. We investigated results of screening audiometry at several health examination offices and studied how it is carried out and its problems.
The rate of positive findings by sex and frequency was relatively high in males with 4kHz alone. The rate of positive findings by job category suggested the possiblity that males of 50 years and older in a specific job category (job category with a relatively high level of noise) would have mild noise-induced deafness. Based on the results of these investigations, we studied on what extent noise-induced deafness is detected by a special health examination at the noiso works hops.
As a result, the number workers exposed to noise of more than Leq 85dB (A) was estimated at about 2, 500, 000. Of them, about 200, 000 to 400, 000 were suspected of have noise-induced deafness.
