SIRT7 and diabetes mellitus: As shown in Table 3, univariate Cox regression analysis revealed that higher SIRT7 levels (HR = 1.23, 95% CI 1.11–1.37, P < 0.001), along with conventional risk factors including type 2 diabetes mellitus (HR = 2.05, 95% CI 1.21–3.27, P = 0.008), AST (HR = 1.31, 95% CI 1.14–1.50, P < 0.001) and CK-MB (HR = 1.48, 95% CI 1.25–1.75, P < 0.001) were significantly associated with rehospitalization.