1. Cabinet Office (2013). Annual report on the aging society. https://www8.cao.go.jp/kourei/english/annualreport/2013/2013pdf_e.html (accessed on 20 November 2023).
2. Cabinet Office (2021). Annual report on the aging society. https://www8.cao.go.jp/kourei/english/annualreport/2021/pdf/2021.pdf (accessed on 20 November 2023).
3. An introduction to ROC analysis;Fawcett;Pattern Recognition Letters,2006
4. "Mini-mental state". A practical method for grading the cognitive state of patients for the clinician;Folstein;Journal of Psychiatric Research,1975
5. Frailty in older adults: Evidence for a phenotype;Fried;The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences,2001