Increased care-need in older long-term care insurance users after the 2018 Japan Floods: a retrospective cohort study based on the Japanese long-term care insurance claims.

"Declarations Ethics approval and consent to participateThe protocol for this study was approved by the Epidemiological Research Ethics Review Committee of Hiroshima University (E-1389). Since this study was a retrospective review of subject records in accordance with Japanese ethical guidelines for clinical research, it was not necessary to obtain informed consent from each subject. In addition, we applied for the data to the Ministry of Health, Labour and Welfare, after a prior consultation with the Care database Third-Party Provision Office, and received the data on January 17, 2020 (approval no. 0711-1). Consent for publicationNot applicable. Availability of data and materialsThe data that support the findings of this study are not publicly available due to restrictions stipulated by the Ministry of Health, Labour and Welfare. Competing interestThe authors have no conflicts of interest to declare. FundingThis study is supported by JSPS KAKENHI JP19K19388. Author ContributionsResearch design: Kotaro Ikeda, Shuhei Yoshida, Yuji Okazaki, Daisuke Miyamori and Masatoshi Matsumoto; data analysis: Kotaro Ikeda, Shuhei Yoshida, Daisuke Miyamori, Saori Kashima and Masatoshi Matsumoto; manuscript drafting: Kotaro Ikeda, Shuhei Yoshida, Daisuke Miyamori and Masatoshi Matsumoto; consultation (including review of manuscript before submitting): Yuji Okazaki, Shinya Ishii, Soichi Koike, Keishi Kanno and Masanori Ito. AcknowledgementWe would like to thank Editage (www.editage.com) for English language editing. Competing interest The authors have no conflicts of interest to declare."

"Funding This study is supported by JSPS KAKENHI JP19K19388."