Fig. 4

Serum analytes and their correlation with creatinine clearance over time. All patients with residual diuresis who were followed up for at least 12 months were included. Correlation between the last and the first BTP serum value as well as the last and first creatinine clearance were divided by the amount of follow-up quarters. a- BTP; b- Cystatin C (CysC); c- urea. Data are given as mean and standard deviation. P-values < 0.05 were considered statistically significant; p < 0.05 = *; p < 0.001 = **; p < 0.0001 = ***; p < 0.00001 = ****