Table 1.

Baseline characteristics of the study population (n = 896,546)

Entire Study Population (n = 896,546)aeGFR ≤ 5 ml/min per 1.73 m2 (n = 113,510)eGFR >5 to 10 ml/min per 1.73 m2 (n = 463,277)eGFR >10 to 15 ml/min per 1.73 m2 (n = 220,528)eGFR > 15 ml/min per 1.73 m2 (n = 99,231)
Age (years)64.7 (14.5)59.3 (15.8)64.2 (14.3)66.9 (13.8)68.4 (13.6)
Sex: male (%)53.144.151.757.460.8
Height (cm)167.5 (11.0)166.6 (11.0)167.5 (11)167.9 (11.1)168 (11.2)
Weight (kg)75.2 (21.4)73.6 (21.4)75.3 (21.4)75.7 (21.4)75.5 (21.5)
Body mass index (kg/m2)26.8 (7.3)26.5 (7.2)26.8 (7.3)26.9 (7.3)26.7 (7.3)
Race (%)
    White64.255.463.667.470
    African American29.835.430.12826.2
    Native American1.21.61.31.00.8
    Asian3.45.43.62.72.2
    Other1.32.31.40.90.8
Cause of ESRD (%)
    Diabetes46.73046.153.553.4
    Hypertension28.432.128.62726.9
    Glomerulonephritis7.312.57.85.13.8
    Cystic kidney disease1.52.41.81.00.5
    Other urologic2.54.02.42.12.5
    Other cause9.712.99.88.19.2
    Unknown cause3.86.13.63.23.8
History of diabetes (%)56.237.155.164.166.2
Charlson comorbidity index7.0 (2.3)5.9 (2.4)6.9 (2.2)7.5 (2.1)7.8 (2.1)
Duration of nephrology care prior to dialysis
    <6 months17.417.217.117.118.7
    6 to 12 months43.744.143.043.446.4
    >12 months38.938.839.939.535.0
Employment status summary (%)
    Unemployed19.526.919.716.915.9
    Full-time employee5.89.46.54.12.6
    Part-time employee1.52.11.61.20.8
    Homemaker5.26.55.44.74.2
    Retired by age42.130.140.747.151.0
    Retired because of disability19.115.919.120.320.3
Dialysis modality (%)
    Hemodialysis92.894.192.492.693.5
    Peritoneal7.25.97.67.46.5
Access used on first outpatient dialysis (%)b
    Fistula12.68.413.614.29.5
    Graft4.73.04.75.44.2
    Catheter80.386.279.478.283.7
    Other2.42.52.32.32.6
Serum creatinine (mg/dl)7.2 (3.5)13.7 (4.2)7.6 (1.7)4.9 (0.9)3.4 (0.7)
Blood urea nitrogen (mg/dl)87.8 (33.6)113.9 (37.2)88.3 (30.1)78.6 (30.8)72.7 (32.1)
HbA1c (%)c6.7 (1.6)6.3 (1.3)6.6 (1.6)6.9 (1.7)6.9 (1.7)
Hemoglobin (g/dl)9.8 (1.7)9.1 (1.9)9.8 (1.7)10.1 (1.6)10.3 (1.6)
Hematocrit (%)29.4 (5.4)27.1 (5.8)29.3 (5.3)30.4 (5.1)31.1 (5.2)
  • a Baseline characteristics for continuous variables are presented as mean (SD) and for categorical variables as percent of total. The P value by ANOVA (for continuous variables) or χ2 (for categorical variables) was <0.001 for all categories tested.

  • b The categories of dialysis access are based on responses to question 18.d of CMS form 2728 filled by dialysis units. There is potential inconsistency, specifically if a PD catheter is included into the “Catheter” category vs. “Other” category.

  • c Only reported on data form used after June 1, 2005; n = 21,458.