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Int J Environ Res Public Health. 2019 Mar 14;16(6). pii: E917. doi: 10.3390/ijerph16060917.

Validity of the Japanese Version of the Quick Mild Cognitive Impairment Screen.

Author information

1
Department of Global Health Promotion, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. morita.hlth@tmd.ac.jp.
2
Clinical Sciences Institute, National University of Ireland Galway, H91 TK33 Galway City, Ireland. ronan.ocaoimh@nuigalway.ie.
3
Centre for Gerontology and Rehabilitation, University College Cork, St Finbarrs Hospital, Douglas road, T12 XH60 Cork City, Ireland. ronan.ocaoimh@nuigalway.ie.
4
Institute of Gerontology, The University of Tokyo, Tokyo 113-8656, Japan. murayama@iog.u-tokyo.ac.jp.
5
Clinical Sciences Institute, National University of Ireland Galway, H91 TK33 Galway City, Ireland. W.Molloy@ucc.ie.
6
Department of Preventive Medicine and Public Health, Tokyo Medical University, Tokyo 160-8402, Japan. inoue@tokyo-med.ac.jp.
7
Division of International Health, Graduate School of Medical and Dental Sciences, Niigata University, Niigata 951-8122, Japan. yugo@med.niigata-u.ac.jp.
8
Department of Global Health Promotion, Tokyo Medical and Dental University, Tokyo 113-8510, Japan. fujiwara.hlth@tmd.ac.jp.

Abstract

Early detection of dementia provides opportunities for interventions that could delay or prevent its progression. We developed the Japanese version of the Quick Mild Cognitive Impairment (Qmci-J) screen, which is a performance-based, easy-to-use, valid and reliable short cognitive screening instrument, and then we examined its validity. Community-dwelling adults aged 65⁻84 in Niigata prefecture, Japan, were concurrently administered the Qmci-J and the Japanese version of the standardized Mini-Mental State Examination (sMMSE-J). Mild cognitive impairment (MCI) and dementia were categorized using established and age-adjusted sMMSE-J cut-offs. The sample (n = 526) included 52 (9.9%) participants with suspected dementia, 123 (23.4%) with suspected MCI and 351 with likely normal cognition. The Qmci-J showed moderate positive correlation with the sMMSE-J (r = 0.49, p < 0.001) and moderate discrimination for predicting suspected cognitive impairment (MCI/dementia) based on sMMSE-J cut-offs, area under curve: 0.74, (95%CI: 0.70⁻0.79), improving to 0.76 (95%CI: 0.72 to 0.81) after adjusting for age. At a cut-off of 60/61/100, the Qmci-J had a 73% sensitivity, 68% specificity, 53% positive predictive value, and 83% negative predictive value for cognitive impairment. Normative data are presented, excluding those with any sMMSE-J < 27. Though further research is required, the Qmci-J screen may be a useful screening tool to identify older adults at risk of cognitive impairment.

KEYWORDS:

Japanese; cognitive impairment; older adults; screening; short cognitive screen instrument

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