[The time factor in hypoacusis caused by acoustic trauma]

This article relates the results of a research made about 26 persons who are working in a noisy environment and whose sense of hearing was damaged although the noise did not exceed the authorized limits (90 dB.) the group of persons was examined every year during 5 years and the average hearing loss was computed every year as well. Average and total losses are computed and it appears that the loss during the last year is much higher than during the previous years.