Patients' characteristics of the study population and association with eGFR stage *1.

*1: Stage 1 chronic kidney disease (CKD), estimated glomerular filtration rate (eGFR) ≥90 ml/min/1.73 m2; Stage 2 CKD, eGFR ≥60 to 2; Stage 3 CKD, eGFR ≥30 to 2; Stage 4 CKD, eGFR ≥15 to 2; and Stage 5 CKD, eGFR 2. *2: IQR: interquartile range. *3: P-value was evaluated with single ordered logistic regression model for eGFR stages. *4: P-value was calculated with chi-square test. *5: ACEI, angiotensin converting enzyme inhibitor; ARB, angiotensin II receptor blocker *6: The number of patients who could be measured was small and deleted from the analysis.