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Predictive Validity of a New Instrumental Activities of Daily Living Scale for Detecting the Incidence of Functional Disability among Community-Dwelling Older Japanese Adults: A Prospective Cohort Study

Author

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  • Keitaro Makino

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

  • Sangyoon Lee

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

  • Seongryu Bae

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

  • Yohei Shinkai

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

  • Ippei Chiba

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

  • Hiroyuki Shimada

    (Department of Preventive Gerontology, Center for Gerontology and Social Science, National Center for Geriatrics and Gerontology, Obu 474-8511, Japan)

Abstract

We examined the predictive validity of a newly developed scale—the National Center for Geriatrics and Gerontology Activities of Daily Living (NCGG-ADL)—to measure instrumental activities of daily living (IADL) ability. We tested the scale for detecting new incidences of functional disability among community-dwelling older Japanese adults. Participants were 2708 older adults (mean age = 79.0 years, 51.6% women) living in the community who had no functional decline at baseline. We assessed IADL ability using the NCGG-ADL scale, comprising 13 self-report questions. Next, we assessed their functional disability monthly for 24 months, based on the national long-term care insurance (LTCI) system. Among all participants, 430 (15.9%) had an IADL limitation at baseline, and 289 (10.7%) were newly certified as functionally disabled. Participants scoring ≤ 12 of 13 points in the NCGG-ADL showed a significantly higher risk of functional disability than did those scoring 13 points, even after adjusting for covariates (hazard ratio [95% confidence interval] = 1.58 [1.19–2.09]). We thus validated the NCGG-ADL as a screening tool for assessing the risk of functional disability among community-dwelling older Japanese adults. We conclude that IADL limitations, as measured by the NCGG-ADL, could be useful predictors of functional disability.

Suggested Citation

  • Keitaro Makino & Sangyoon Lee & Seongryu Bae & Yohei Shinkai & Ippei Chiba & Hiroyuki Shimada, 2020. "Predictive Validity of a New Instrumental Activities of Daily Living Scale for Detecting the Incidence of Functional Disability among Community-Dwelling Older Japanese Adults: A Prospective Cohort Stu," IJERPH, MDPI, vol. 17(7), pages 1-9, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:7:p:2291-:d:338411
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    References listed on IDEAS

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    1. Hyuma Makizako & Hiroyuki Shimada & Takehiko Doi & Kota Tsutsumimoto & Sangyoon Lee & Ryo Hotta & Sho Nakakubo & Kazuhiro Harada & Sungchul Lee & Seongryu Bae & Kenji Harada & Takao Suzuki, 2015. "Cognitive Functioning and Walking Speed in Older Adults as Predictors of Limitations in Self-Reported Instrumental Activity of Daily Living: Prospective Findings from the Obu Study of Health Promotion," IJERPH, MDPI, vol. 12(3), pages 1-12, March.
    2. Freedman, Vicki A. & Martin, Linda G. & Schoeni, Robert F. & Cornman, Jennifer C., 2008. "Declines in late-life disability: The role of early- and mid-life factors," Social Science & Medicine, Elsevier, vol. 66(7), pages 1588-1602, April.
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