CKM and type 2 diabetes mellitus: Among the overall included patients, a higher percentage of patients with early-onset T2DM had CKM stage 2 (68.76% vs. 39.36%) and a lower percentage of CKM stage 3 (25.54% vs. 46.33%) and CKM stage 4 (5.7% vs. 14.31%) compared to late-onset T2DM.