Table 1. Clinical characteristics of hemodialysis, peritoneal dialysis, and total patient cohortsa

Total Patient CohortHemodialysis PatientsPeritoneal Dialysis PatientsP Value
a PRU, percent reduction urea; Ca, calcium; Pi, phosphate; iPTH, parathyroid hormone
N515357 (69.3%)158 (30.7%)
Age59.9 (±16.7)60.8 (16.7)57.7 (16.1)0.051
Female gender207 (40.2%)133 (37.3%)74 (46.8%)0.041
Diabetes176 (34.2%)121 (33.9%)55 (34.8%)0.840
Race0.005
    White298 (57.9%)195 (54.6%)103 (65.2%)
    Asian141 (27.4%)113 (31.6%)28 (17.7%)
    other76 (14.8%)49 (13.7%)27 (17.1%)
Dialysis duration (mo)20.1 (6.1–36.0)24.3 (7.6–42.3)12.4 (4.7–24.8)<0.001
    <6 mo125 (24.3%)78 (21.8%)47 (29.7%)0.001
    6–18 mo117 (22.7%)67 (18.8%)50 (31.6%)
    >18 mo273 (53.0%)212 (59.4%)61 (38.6%)
PRUNA72.99 (7.95)NA
Total Kt/VNANA2.40 (0.59)
Dialysis adequacy0.973
    PRU ≤65, Kt/V ≤1.869 (13.4%)47 (13.2%)22 (13.9%)
    PRU 66–70, Kt/V 1.9–2.1102 (19.8%)71 (19.9%)31 (19.6%)
    PRU >70, Kt/V >2.1344 (66.8%)239 (66.9%)105 (66.5%)
Previous transplant36 (7.0%)29 (8.1%)7 (4.4%)0.130
Hemoglobin (g/L)115.5 (17.1)114.6 (16.9)117.3 (17.4)0.102
Albumin (g/L)35.0 (4.8)35.6 (4.3)33.5 (5.5)<0.001
Cholesterol (mmol/L)4.98 (1.15)4.74 (1.34)5.07 (1.06)0.105
Triglycerides (mmol/L)2.14 (2.13)1.85 (1.17)2.27 (1.54)0.042
Ca (mmol/L)2.32 (0.22)2.32 (0.22)2.31 (0.23)0.694
    < 2.50416 (80.8%)287 (80.4%)129 (81.6%)0.943
    2.50–2.5529 (5.6%)21 (5.9%)8 (5.1%)
    2.55–2.6537 (7.2%)25 (7.0%)12 (7.6%)
    >2.6533 (6.4%)24 (6.7%)9 (5.7%)
Pi (mmol/L)1.68 (0.53)1.69 (0.56)1.67 (0.46)0.632
    <1.78315 (61.2%)219 (61.3%)96 (60.8%)0.387
    1.78–1.9450 (9.7%)30 (8.4%)20 (12.7%)
    1.95–2.2686 (16.7%)60 (16.8%)26 (16.5%)
    >2.2664 (12.4%)48 (13.4%)16 (10.1%)
Ca*Pi product (mmol2/L2)3.90 (1.29)3.91 (1.32)3.87 (1.24)0.771
    <4.43362 (70.3%)249 (69.8%)113 (71.6%)0.552
    4.43–4.8451 (9.9%)39 (10.9%)12 (7.6%)
    4.84–5.6459 (11.5%)38 (10.6%)21 (13.3%)
    >5.6443 (8.4%)31 (8.7%)12 (7.6%)
iPTH (pmol/L)15.8 (6.9–37.3)14.4 (6.5–36.3)18.2 (8.2–39.1)0.098
    <27.3343 (66.6%)246 (68.9%)97 (61.4%)0.095
    ≥27.3172 (33.4%)111 (31.1%)61 (38.6%)
Pi, Ca, and iPTH0.232
    Pi <1.78, Ca <2.5, iPTH >27.380 (15.5%)53 (14.8%)27 (17.1%)
    Pi <1.78, Ca >2.5, iPTH >27.37 (1.4%)4 (1.1%)3 (1.9%)
    Pi <1.78, Ca >2.5, iPTH <27.349 (9.5%)40 (11.2%)9 (5.7%)
    Pi <1.78, Ca <2.5, iPTH <27.3179 (34.8%)122 (34.2%)57 (36.1%)
    Pi >1.78, Ca <2.5, iPTH <27.387 (16.9%)67 (18.8%)20 (12.7%)
    Pi >1.78, Ca <2.5, iPTH >27.370 (13.6%)45 (12.6%)25 (15.8%)
    Pi >1.78, Ca >2.5, iPTH >27.315 (2.9%)9 (2.5%)6 (3.8%)
    Pi >1.78, Ca >2.5, iPTH <27.328 (5.4%)17 (4.8%)11 (7.0%)