書誌事項
- タイトル別名
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- THE EFFECT OF AGING ON OBSERVATION IN HEARING IN THE SAME INDIVIDUALS OVER A 5 YEAR PERIOD
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抄録
The purpose of this study was to investigate the process of changes in hearing of pure tones with aging.<BR>Among individuals who had undergone thorough medical examination for the purpose of annual health-checks, 293 males (586 ears) whose hearing level had been examined for five years or more were enrolled in this study. Cases having conductive deafness or known sensori-neural deafness were excluded. Since the most typical change with aging is observed at 8 kHz, the investigation was carried out only on hearing at 8 kHz.<BR>Hearing level increasingly declined with advancing age. Hearing distribution for young subjects showed a peak in the normal hearing level range. This peak decreased with aging, and another peak appeared at 50 dB.<BR>Investigation of differences in hearing in the individuals over the five years showed that most subjects had a hearing level difference of 0 dB up to 54 years of age. From 55 years old onward, however, the difference was 5 dB. This indicates that gradual deterioration of hearing level with aging occurs most frequently.<BR>On the other hand, in some subjects, deafness progressed faster. Thirty-four and a half percent of the subjects had deteriorations of 20 dB or more in a single year during the entire observation period. A deterioration of 20 dB or more was noted in 4 % of the young and 8% of the elderly. Such rapid progression of deafness was believed to be involved in formation of the 50 dB peak in the hearing distribution.
収録刊行物
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- 日本耳鼻咽喉科学会会報
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日本耳鼻咽喉科学会会報 95 (7), 1035-1041,1143, 1992
一般社団法人 日本耳鼻咽喉科頭頸部外科学会