Table 1. Characteristics of the study population at ESRD onset from the CMS Medical Evidence Report Form (n = 107,922)

Patient CharacteristicsStudy Population n = 107,922HD n = 93,900PD n = 14,022
a At first dialysis per MDRD formula (n = 34,585; HD = 29,676; PD = 4909) (26).
b Includes history of coronary artery disease, myocardial infarction, coronary artery bypass surgery, angioplasty, or abnormal angiography.
c Includes a history of peripheral vascular disease amputation, intermittent claudication, or absent pulses.
d P < 0.05,
e P < 0.01,
f P < 0.001 for bivariate comparisons.
Demographics
    Age of onset of ESRD (mean yr ± SD)61.5 ± 15.362.3 ± 15.256.5 ± 15.2f
    race
        % White63.46273.4f
        % Black31.132.620.8f
        % Asian3.73.64.2e
    gender (% male)5352.853.8d
    cause of ESRD (% diabetes)44.344.046.1f
Laboratory values (mean ± SD)
    serum albumin (g/dl)3.2 ± 0.73.2 ± 0.653.4 ± 0.64f
    hematocrit (%)28.1 ± 5.327.9 ± 5.329.3 ± 5.3f
    GFR (MDRD) (ml/min)a8.2 ± 2.98.1 ± 2.98.5 ± 2.9f
Comorbid conditions (% yes)
    diabetes (history and/or nephropathy)39.339.438.7
    hypertension72.672.573.2
    coronary artery diseaseb25.926.422.7f
    myocardial infarction8.99.08.4d
    cardiac arrest/dysrhythmia6.46.55.3f
    congestive heart failure32.733.924.7f
    cerebrovascular disease8.99.36.7f
    peripheral vascular diseasec14.615.012.1f
    chronic obstructive lung disease6.97.34.4f
    tobacco use6.26.26.4
    AIDS0.550.570.41d
    neoplasm4.95.23.0f
    BMI (mean kg/m2 ± SD)25.7 ± 5.825.6 ± 5.925.9 ± 5.3f