LCN2 and type 2 diabetes mellitus: In addition, the ROC curve analysis showed that NGAL could predict the occurrence of MACCE in T2DM patients ≥ 65 years accurately (AUC = 0.79, 95% CI: 0.75–0.84, P < 0.001); sdlDL-C could be a strong predictor of MACCE in T2DM patients ≥ 65 years (AUC = 0.76, 95% CI: 0.72–0.80, P < 0.001); and the joint detection and prediction ability of the two was improved greatly (AUC = 0.87, 95% CI: 0.84–0.90, P < 0.001).