Table 2. Baseline characteristics 1996 to 1999, comparing those included and those excluded because Medicare was not the sole, primary payer

Dialysis Inception 1996 to 1999Included (%; n = 196,356)Excluded (%; n = 96,076)PaOdds Ratio for Exclusionb95% CIbPb
a Using the χ2 test.
b Using a multiple logistic regression model including the variables shown in the first column. The reference categories were peritoneal dialysis; age 20 to 44 yr; male gender; other race; non-Hispanic ethnicity; 1996 as year of dialysis inception; absence of congestive heart failure, atherosclerotic heart disease, cardiac arrest or dysrhythmia, stroke or transient ischemic attack, peripheral vascular disease, chronic obstructive pulmonary disease, current tobacco use, cancer, alcohol or drug dependence, inability to ambulate or transfer; hemoglobin 11 to 12 g/dl; serum albumin 3.1 to 3.4 g/dl; estimated GFR 5.1 to 10 ml/min per 1.73 m2; and body mass index 18.5 to 24.9 kg/m2.
c Age data were missing in 0.007% of patients and 0.008% of excluded individuals.
Mode of dialysis<0.0001
    hemodialysis89.686.00.920.90 to 0.94<0.0001
    peritoneal dialysis10.414.01
Age (yr)c<0.0001
    0 to 190.82.01.471.37 to 1.57<0.0001
    20 to 4413.221.61
    45 to 6430.747.40.980.96 to 1.000.07
    65 to 7430.617.70.360.35 to 0.37<0.0001
    ≥7524.711.40.280.27 to 0.29<0.0001
Gender<0.0001
    male52.954.9
    female47.145.10.960.95 to 0.98<0.0001
Race<0.00011
    white61.460.60.930.89 to 0.970.001
    black32.130.40.700.67 to 0.74<0.0001
    Asian3.14.61.261.18 to 1.33<0.0001
    other3.44.4
Hispanic ethnicity<0.0001
    yes11.512.80.890.87 to 0.91<0.0001
    no88.587.21
Year of dialysis inception<0.0001
    199623.521.31
    199724.224.21.131.10 to 1.16<0.0001
    199825.526.21.181.15 to 1.21<0.0001
    199926.828.21.221.19 to 1.24<0.0001
Congestive heart failure34.126.1<0.00010.91<0.0001
Atherosclerotic heart disease27.320.4<0.00010.950.93 to 0.97<0.0001
Cardiac arrest or dysrhythmia6.64.5<0.00010.970.94 to 1.010.1
Stroke or transient ischemic attack9.56.7<0.00010.870.84 to 0.90<0.0001
Peripheral vascular disease15.311.3<0.00010.910.88 to 0.93<0.0001
Diabetes46.744.2<0.00010.920.91 to 0.94<0.0001
Chronic obstructive pulmonary disease7.44.9<0.00010.900.87 to 0.93<0.0001
Current tobacco use5.65.2<0.00010.780.75 to 0.81<0.0001
Cancer5.04.0<0.00011.000.96 to 1.041.00
Alcohol or drug dependence2.32.5<0.00010.910.87 to 0.960.0009
Inability to ambulate or transfer4.33.1<0.00010.960.91 to 1.000.05
Hemoglobin (g/dl)<0.0001
    missing6.35.00.770.74 to 0.81<0.0001
    <1176.376.20.920.90 to 0.94<0.0001
    11 to 1210.911.51
    >126.67.41.041.00 to 1.080.05
Serum albumin (g/dl)<0.0001
    missing22.621.61.010.99 to 1.040.4
    ≤3.030.830.00.980.96 to 1.010.1
    3.1 to 3.419.018.01
    ≥3.527.730.41.081.05 to 1.11<0.0001
Estimated GFR (ml/min per 1.73 m2)<0.0001
    missing2.51.70.670.63 to 0.71<0.0001
    ≤5.016.820.11.010.99 to 1.030.6
    5.1 to 10.056.958.01
    >10.023.820.20.940.92 to 0.96<0.0001
Body mass index (kg/m2)<0.0001
    missing2.92.20.780.73 to 0.82<0.0001
    <18.56.66.00.950.92 to 0.980.004
    18.5 to 24.942.140.11
    25 to 29.926.727.31.010.99 to 1.030.2
    ≥3021.724.40.990.97 to 1.010.4