Estimates of the size of the hearing-impaired elderly population in Japan and 10-year incidence of hearing loss by age, based on data from the National Institute for Longevity Sciences-Longitudinal Study of Aging (NILS-LSA)

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  • Uchida Yasue
    Department of Otorhinolaryngology, Aichi Medical University Department of Otorhinolaryngology, National Center for Geriatrics and Gerontology
  • Sugiura Saiko
    Department of Otorhinolaryngology, National Center for Geriatrics and Gerontology
  • Nakashima Tsutomu
    Department of Otorhinolaryngology, Cognitive and Speech Medicine, Nagoya University School of Medicine
  • Ando Fujiko
    Department of Health and Medical Sciences, Aichi Shukutoku University Department for Development of Preventive Medicine, National Center for Geriatrics and Gerontology
  • Shimokata Hiroshi
    Department for Development of Preventive Medicine, National Center for Geriatrics and Gerontology

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Other Title
  • 全国高齢難聴者数推計と10年後の年齢別難聴発症率―老化に関する長期縦断疫学研究（NILS-LSA）より
  • ゼンコク コウレイ ナンチョウシャスウ スイケイ ト 10ネンゴ ノ ネンレイ ベツ ナンチョウ ハッショウリツ : ロウカ ニ カンスル チョウキ ジュウダンエキガク ケンキュウ(NILS-LSA)ヨリ

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Abstract

Aim: The number of hearing-impaired elderly people in Japan remains to be clarified. In the present study, we analyzed the data from the National Institute for Longevity Sciences-Longitudinal Study of Aging (NILS-LSA) to ascertain the prevalence and 10-year incidence of hearing loss in Japanese elderly people.<br> Methods: Hearing loss prevalence was calculated based on 2,194 subjects who had been included in the 6th survey of the NILS-LSA (2008-2010) and was represented as crude rates (calculation A) and as rates after the exclusion of occupational noise-exposure and ear disease history (calculation B). Estimates of hearing loss incidence were performed at a national level based on demographic statistics. Subsequently, we analyzed the 10-year incidence in 465 subjects showing no hearing loss at baseline (1997-2000 survey) all of whom also participated in the 6th survey of the NILS-LSA (2008-2010).<br> Results: The prevalence of hearing loss greatly increased after the age of 65 years. The prevalence observed in calculation A was 43.7%, 51.1%, 71.4%, and 84.3% in men aged 65-69, 70-74, 75-79, and over 80 years old, respectively. In women, the prevalence for the same age groups was 27.7%, 41.8%, 67.3%, and 73.3%, respectively. The size of the hearing-impaired population older than 65 years old was estimated to be 16,553,000. The 10-year incidence rates of hearing impairment in the 60-64- and 70-74-year-old age groups were 32.5% and 62.5% (age at baseline), respectively. These rates rapidly increased with age, although a number of elderly people with good hearing were also observed.<br> Conclusions: Age-related hearing loss is an issue of national importance. These results also indicated that it is possible to preserve good hearing into later in life, and that hearing loss in the elderly may be preventable.<br>

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