The most common index is the frailty phenotype by Fried et al., 5) which defined frailty as the presence of three or more of the following five components: self-reported exhaustion, decreased grip strength, slow walking speed, low physical activity, and unintended weight loss. 5) It is important to define frailty based on physical and social determinants for the early detection of people at a high risk of frailty, as well as for prevention of frailty. 6) Statistics Korea reported that 34.2% of individuals aged above 65 years were living in one-person
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