Table 1. Characteristics of study cohort at baselinea

Patient CharacteristicTotal Cohort (N = 8920)bStudy Cohort Included in Multivariate Modelc (N = 6862)
N (%) or Mean (SD)
a HTN, hypertension; GN, glomerulonephritis; PKD, polycystic kidney disease; IQR, interquartile range; CVD, cardiovascular disease.
b Subgroup numbers may not add up to total because of missing data.
c Patients with missing covariate values were excluded from the multivariate model.
d Defined as a previous diagnosis of coronary artery disease, myocardial infarction, coronary artery bypass, angioplasty, cardiac arrest, or congestive heart failure.
e Mean BP = (systolic BP + 2*diastolic BP)/3. BP measurements were performed predialysis (for hemodialysis patients) or randomly (for peritoneal dialysis patients).
Gender
    male4589 (51.4%)3562 (51.9%)
    female4331 (48.6%)3300 (48.1%)
Race
    white4484 (52.9%)3664 (53.4%)
    black3371 (39.8%)2711 (39.5%)
    Asian160 (1.9%)128 (1.9%)
    other453 (5.4%)359 (5.2%)
Age (yr)60.0 (15.8)60.0 (15.7)
Primary renal disease
    diabetes2861 (34.1%)2285 (33.3%)
    HTN2510 (29.9%)2085 (30.4%)
    other1350 (16.1%)1068 (15.6%)
    primary GN965 (11.5%)592 (8.6%)
    PKD710 (8.5%)832 (12.1%)
Treatment modality at study start
    hemodialysis7907 (88.7%)6139 (89.5%)
    peritoneal dialysis1012 (11.4%)723 (10.5%)
Time on dialysis before start of study
    incident (90 d)2129 (23.9%)1715 (25.0%)
    91 d–1 yr1306 (14.6%)967 (14.1%)
    1–2 yr1375 (15.4%)1046 (15.3%)
    2+ yr4110 (46.1%)3134 (45.7%)
Smoker
    current2140 (28.2%)1746 (27.5%)
    former1419 (18.7%)1220 (19.2%)
    never4031 (53.1%)3389 (53.3%)
Previous CVDd (yes)4381 (53.8%)3716 (54.2%)
Undernourished (yes)1154 (14.4%)964 (14.1%)
Serum albumin (g/dl)3.68 (0.45)3.68 (0.45)
Total cholesterol (mg/dl)179.4 (49.3)179.3 (49.4)
Hemoglobin (g/dl; median, IQR)10.1 (9.0–11.1)10.1 (9.0–11.1)
Mean BPe (mmHg)103.4 (14.0)103.5 (14.1)
Weight (kg; median, IQR)68.5 (58.5–80)68.9 (58.6–80.5)
Height (cm)167.5 (11.0)167.6 (11.0)