GPCPD1 and sarcopenia: As shown in Figure 7, we found the AUC values of GPCPD1, MT1X, ARHGAP36, FAM171A1, ZNF415, and RXRG on the validation dataset were 0.928, 0.75, 0.978, 0.961, 0.811, and 0.906, indicating that the six biomarkers had high diagnostic accuracy for sarcopenia.