Table 3. Serum albumin, and plasma total cresol and Il-6 concentrations before and after either HFR or HD.

	Before HFR	After HFR	Reduction Ratio (%)	Before HD	After HD	Reduction Ratio (%)
Albumin (g/dl)	3.6±0.2	4.2±0.3	-	3.8±0.3	4.2±0.2	-
Total Cresol (mg/l)	11.6±6.3	5.8±2.7*	53.6±12.5	8.6±5.3	5.4±3.0∥	37.1±20.2°
IL-6 (pg/ml)	57.6±58.3	48.4±53.1	4.3±34.5	48.7±33.6	53.9±48.3	-

The Table reports the mean ± standard deviation of the values of serum albumin, plasma total cresol and IL-6 concentrations obtained in the same 12 ESRD patients before and after two different dialysis sessions performed with standard bicarbonate hemodialysis (HD) or with HFR supra, as indicated. The Table also reports the Reduction Ratio of p-cresol and IL-6 obtained with both HFR and HD. As described in the legend to Table 2, total cresol concentration is the sum of the concentration of p-cresol and of its metabolites. The post-dialysis data shown in the table have been corrected for hemoconcentration as reported in the Methods section.

*p<0.005 vs preHFR,

^∥p<0.005 vs preHD at Mann-Whitney test;

^°p<0.05 vs RR HFR at Student's t test for paired data.