Background and Objective: The purpose of this investigation was to examine the prevalence,
related factors, and cut-off value of body mass index for sarcopenia in community-dwelling
elderly covered by long-term care insurance.
Methods: Design was a cross-sectional study, in which113 consecutive community-dwelling elderly
with long-term care insurance who underwent rehabilitation at a daycare center in Japan from
January 2016 to January 2018, those who were aged ≥65 years old and could walk were included.
Those in whom skeletal muscle mass index could not be measured were excluded. The determination
of sarcopenia was made according to the criteria of the Asian Working Group for Sarcopenia.
We analyzed the data with the unpaired t-test, χ2 test, logistic regression analysis, and receiver operating
Results: The 99 elderly meeting the criteria were included and divided into the sarcopenia group
(n=36) and no sarcopenia group (n=63). The prevalence was 36.4%. The sarcopenia group was significantly
older and had lower body mass index, skeletal muscle mass index, and grip strength than
the group without sarcopenia (p <0.05). Age and body mass index were extracted as significant sarcopenia-
related factors (p <0.05). The cut-off value of body mass index for sarcopenia was 22.6
Conclusion: The prevalence of sarcopenia in the elderly in the long-term care insurance region
was 36.4%, and age and body mass index were extracted as sarcopenia-related factors. The cut-off
value of body mass index for sarcopenia was 22.6 kg/m2.