Table 1. Baseline patient characteristics by body mass index (BMI) groups (N = 70,028)a

CharacteristicNormal BMI (n = 34,046)High BMI (n = 35,982)
a Normal BMI, 18.5 ≤ BMI ≤ 24.9 kg/m2; high BMI, ≥25.0 kg/m2.
b Differences between groups were not significant (P ≥ 0.05). For all other comparisons, P < 0.05.
Age, mean ± SD (yr)66 ± 15.064 ± 13.3
Male gender, n (%)18,106 (53)15,582 (43)
Race, n (%)
    white23,231 (68)23,431 (65)
    African American7891 (23)10,033 (28)
    other2924 (9)2518 (7)
Medicare insurance, n (%)22,043 (65)21,179 (59)
Comorbid condition, n (%)
    diabetes as cause of renal failure13,057 (38)18,795 (52)
    coronary artery disease11,727 (34)11,630 (32)
    cerebrovascular accident4123 (12)3677 (10)
    peripheral vascular disease6783 (20)6385 (18)
    heart failureb13,962 (41)14,976 (42)
    lung disease3412 (10)2713 (8)
    cancer2084 (6)1713 (5)
    current smoker2334 (7)1691 (5)
Functional status, n (%)
    requires assistance to transferb626 (2)610 (2)
    requires assistance to ambulateb1819 (5)1850 (5)
Nutritional parameters
    BMI, mean ± SD (kg/m2)22.0 ± 1.830.5 ± 4.9
    weight (kg)62.2 ± 9.282.9 ± 14.6
    24-h urine creatinine (g/dl)0.76 ± 0.350.86 ± 0.39
    Serum albumin, mean ± SD (g/dl)3.1 ± 0.73.2 ± 0.6
Outcome
    all-cause death16,285 (48)13,677 (38)
    cardiovascular death8388 (25)7413 (21)