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The revised European Working Group on Sarcopenia in Older People consensus stated that ultrasonography is reliable and valid for assessing muscle size in older adults. The present study aimed to determine the predictive accuracy of ultrasonography for sarcopenia in older adults in Japan.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A total of 1229 participants aged 65\u201391\u2009years were included in this cross\u2010sectional study. The thickness of the anterior compartment of the right thigh was assessed using B\u2010mode ultrasonography. The measurement position was at the midpoint of the thigh. In addition, the grip strength, gait speed, Five\u2010Time Sit\u2010to\u2010Stand Test, Short Physical Performance Battery score and skeletal muscle mass index were evaluated. Sarcopenia was diagnosed based on the Asian Working Group for Sarcopenia 2019 algorithm. We calculated the area under the receiver operating characteristic curve.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The area under the receiver operating characteristic curves (95% confidence intervals) and cutoff values for the thigh muscle thickness in sarcopenia were 0.901 (0.856\u20130.946) and 4.0\u2009cm in men, respectively, and 0.923 (0.851\u20130.995) and 3.1\u2009cm in women, respectively. The area under the receiver operating characteristic curve for each subdomain of sarcopenia, such as grip strength and gait speed, ranged from 0.618 to 0.872.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>In the present study, the suggested cutoff mid\u2010thigh muscle thicknesses on ultrasonography for predicting sarcopenia were 4.0\u2009cm in men and 3.1\u2009cm in women. <jats:bold>Geriatr Gerontol Int 2024; 24: 156\u2013161<\/jats:bold>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ggi.14714","type":"journal-article","created":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T10:04:47Z","timestamp":1698401087000},"page":"156-161","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Thigh muscle thickness on ultrasonography for diagnosing sarcopenia: The <scp>Kyoto\u2010Kameoka<\/scp> study"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2304-6872","authenticated-orcid":false,"given":"Tsukasa","family":"Yoshida","sequence":"first","affiliation":[{"name":"National Institutes of Biomedical Innovation, Health and Nutrition  Settsu city Japan"},{"name":"Institute for Active Health, Kyoto University of Advanced Science  Kameoka city Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuya","family":"Watanabe","sequence":"additional","affiliation":[{"name":"National Institutes of Biomedical Innovation, Health and Nutrition  Settsu city Japan"},{"name":"Institute for Active Health, Kyoto University of Advanced Science  Kameoka city Japan"},{"name":"Biwako Seikei Sport College  Otsu city Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keiichi","family":"Yokoyama","sequence":"additional","affiliation":[{"name":"National Institutes of Biomedical Innovation, Health and Nutrition  Settsu city 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