Clinical characteristics of the study participants and comparison of patients in the different GFR categories or receiving HD.

NA: data not available. Continuous variables are expressed as mean (standard deviation). P values were calculated using one-way analysis of variance or Fisher’s exact test. G1: GFR ≥ 90 ml/min/1.73m2, G2: GFR = 60 to 90 ml/min/1.73m2, G3: GFR = 30 to 60 ml/min/1.73m2, G4: GFR = 15 to 30 ml/min/1.73m2, G5: GFR ≤ 15 ml/min/1.73m2, HD: hemodialysis. Clinical characteristics of the study participants and comparison of patients in the different GFR categories or receiving HD.