KITLG and sarcopenia: In the development cohort, significant differences were noted in proportion of the sex (p < 0.001), height (p < 0.001), weight (p = 0.024), mean thickness of RFM (p = 0.037), mean thickness of SCF (p = 0.005), and mean CSA of RF (p = 0.012) between the “sarcopenia” and “non-sarcopenia” groups.