CNDP1 and chronic kidney disease: To assess factors predicting urinary CN-1 concentrations, relevant kidney disease-associated variables, i.e., age, gender, baseline kidney disease (diabetic or nondiabetic CKD), renal replacement therapy, serum CN-1 concentrations, (CTG)5 homozygosity, eGFR, ACR, and residual diuresis, were selected as independent predictors of log-transformed urinary CN-1 concentrations [log (urinary CN-1 concentration)] (Table 2).