Vocational Hearing Deficiencies in a Paper Manufacturing Mill

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  • 製紙工場に於ける職業性難聴について
  • セイシ コウジョウ ニ オケル ショクギョウセイ ナンチョウ ニ ツイテ

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Audiometric examination was carried out on 178 workers working in noisy shops of our paper mill, and occupational hearing loss was found out among those workers as briefly mentioned below.<br>1) The number of workers with abnormal audiometric level (decrease more than 30db) was 31, 17.4% out of the subjects.<br>2) The abnormality rate increased by aging, and it reached 50% among those of 50 years or older of age.<br>3) When classified by the lenght of employment, those workers within 4 years and more than ten years were found to include more workers with hearing loss in comparison to those between 5 to 9 years. It was rather dificult to explain this result.<br>4) When the audiometric level at 4000 cycles per second among the abnormals was analysed, the average loss of decibel increased by aging. By the length of engagement, those of more than 15 years showed the higher loss of decibel

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