The observed relationship is described by the linear regression equation:(2)YSPPB, total score = 13.642 − 0.061Xage, years − 0.026Xleptin, ng/mL, where YSPPB, total score is the total SPPB score, Xage, years is age (years), and Xleptin, ng/mL is serum leptin level in patients with CAD (ng/mL). Here, LEP is linked to coronary artery disorder.