Table 1. Baseline characteristics 1991 to 1995, comparing those included and those excluded because Medicare was not the sole, primary payera

Dialysis Inception 1991 to 1995Included (%; n = 197,095)Excluded (%; n = 69,245)PbOdds Ratio for Exclusionc95% CIcPc
a CI, confidence interval.
b Using the χ2 test.
c 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, and 1991 as year of dialysis inception.
d Age data were missing in 0.007% of patients and 0.049% of excluded individuals.
Mode of dialysis<0.0001
    hemodialysis85.680.50.880.86 to 0.90<0.0001
    peritoneal dialysis14.419.61
Age, yd<0.0001
    0 to 190.92.01.291.20 to 1.39<0.0001
    20 to 4415.025.91
    45 to 6430.050.20.930.91 to 0.96<0.0001
    65 to 7433.114.70.230.23 to 0.24<0.0001
    ≥7521.07.20.170.17 to 0.18<0.0001
Gender<0.0001
    male54.257.41
    female45.842.60.940.93 to 0.96<0.0001
Race<0.0001
    white61.764.51.231.16 to 1.31<0.0001
    black33.628.70.750.71 to 0.80<0.0001
    Asian2.64.41.791.65 to 1.93<0.0001
    other2.22.41
Hispanic ethnicity<0.0001
    yes5.24.80.600.58 to 0.63<0.0001
    no94.895.21
Year of dialysis inception<0.0001
    199117.815.21
    199219.516.41.010.98 to 1.040.6
    199319.817.31.081.05 to 1.12<0.0001
    199420.724.31.471.43 to 1.52<0.0001
    199522.226.81.541.49 to 1.58<0.0001