Table 3.

Peritoneal membrane transport status and solute clearances according to PD modality, at 1 year of treatment

VariableCAPDAPDP
Peritoneal urea Kt/V1.45 ± 0.31.71 ± 0.5<0.0001a
Peritoneal creatinine clearance (L/wk per 1.73 m2)38.7 ± 9.140.0 ± 13.50.527
Peritoneal phosphate clearance (L/wk per 1.73 m2)36.5 ± 9.236.7 ± 12.10.928
D/P Cr0.69 ± 0.10.71 ± 0.10.319
    fast transporter17/30 (56.7%)13/30 (43.3%)
    fast-average transporter98/163 (60.1%)65/163 (39.9%)
    slow-average transporter42/67 (62.7%)25/67 (37.3%)
    slow transporter00
D/P Ph0.61 ± 0.10.61 ± 0.10.884
    fast transporter23/42 (54.8%)13/42 (45.2%)
    fast-average transporter49/81 (60.5%)32/81 (39.5%)
    slow-average transporter52/92 (56.5%)40/92 (43.5%)
    slow transporter33/45 (73.3%)12/45 (27.7%)
  • Values are expressed as frequencies and percentages for categorical variables, mean ± SD for continuous variables. Patients are categorized, concerning creatinine transport status, as slow (D/P Cr ≤ 0.49), slow-average (0.50 ≤ D/P Cr ≤ 0.64), fast-average (0.65 ≤ D/P Cr ≤ 0.80), and fast (D/P Cr ≥ 0.81) transporters, according to the criteria defined by Twardowski et al.. Patients are categorized, concerning phosphate transport status, as slow (D/P Ph < 0.47), slow-average (0.47 ≤ D/P Ph < 0.57), fast-average (0.57 ≤ D/P Ph < 0.68), or fast (D/P Ph ≥ 0.68) transporters, according to mean ± SD of dialysate/plasma phosphate ratio (D/P Ph).

  • a P < 0.005 comparisons between patients in CAPD versus APD using the t test if data were parametric and the Mann-Whitney U test if nonparametric.