Differential association of frailty with the incidence of mild and severe disability in older people: A 3-year cohort study

Background Frailty is associated with the incidence of disability in older people, but few studies investigated differences in the association of frailty with mild and severe disability by Japanese long-term care insurance certification. This study investigated the association of frailty with the incidence of mild and severe disability separately. Methods This was a retrospective cohort study for 3 years. The participants were community-dwelling people aged ≥ 65 in Okayama City. We assessed frailty status using the Kihon Checklist and defined outcomes as mild and severe disability in long-term care insurance certifications. Multinomial logistic regression analysis was used to investigate the association of frailty with the incidence of mild and severe disability.