LCN2 and type 2 diabetes mellitus: ROC curve analysis showed that both NGAL (AUC = 0.79, 95% CI: 0.75–0.84, P < 0.001) and sdlDL-C (AUC = 0.76, 95% CI: 0.72–0.80, P < 0.001) could predict the occurrence of MACCE in T2DM patients aged ≥ 65 years.