Demographic variables including etiology of CKD, age, and gender were obtained from patients' clinic charts. All blood samples were taken after 10 hours of overnight fasting. Serum urea, creatinine, and albumin levels were analyzed. Creatinine clearance [(CCr) dialysate, urine, and total], Kt/V (dialysate, urine, and total) were calculated weekly. Daily volumes (UF), 24-hour protein, and albumin losses (dialysate, urine) were recorded also. Parameters at the beginning of study and at the end of 6th month were evaluated. During the study, the dialysis regime remained same in all patients. In both groups, investigators analyzed blood, 24-hour urine (in patients with residual diuresis >100mL daily), peritoneal effluent fluid at 4 hours' and 24 hours' dwell time. Peritoneal effluent fluid at 24 hours' dwell time was used to determine total protein, albumin, and at 24 hours' dwell time to determine urea and creatinine. The urea kinetic test in closest time proximity to the PET was used in the analysis.