Table 1.

Demographics, dialysis treatment, and biochemical variables

Variable
Age (yr) (median, minimum − maximum)75 (30–87)
Sex (man/woman) [n (%)]40/35 (54/46)
Vintage (mo)20 (9–31.5)
Qb,effective (ml/min)304.0 (40.1)
Qd (ml/min)505.6 (22.7)
Unipuncture/bipuncture [n (%)]8/67 (11–89)
Residual renal function (yes versus no) (%)39/36 (52/48)
Urea (mg/dl)119.3 (26.9)
Creatinine (mg/dl)6.9 (2.1)
Albumin (mg/L)39.5 (3.5)
Total p-cresyl sulfate (μM)183.6 (114.4–305.3)
Free p-cresyl sulfate (μM)10.3 (5.6–19.9)
Free fraction p-cresyl sulfate0.054 (0.042–0.070)
Total indoxyl sulfate (μM)104.7 (67.2–134.6)
Free indoxyl sulfate (μM)9.1 (5.4–12.5)
Free fraction indoxyl sulfate0.081 (0.068–0.106)
  • Data are expressed as mean (SD) or median (25–75 percentile) as appropriate. To convert creatinine in mg/dl to μM, multiply with 88.4.

  • Qb,effective, effective blood flow; Qd, dialysate flow.