Table 1.

Patient characteristics by baseline phosphate levela

CharacteristicNPhosphate Level (mg/dl)Pb
<3.53.5 to 5.5>5.5
Total101074 (7.3%)559 (55.4%)377 (37.3%)
Demographic
    age (yr; mean [SD])101064.4 (15.1)59.8 (14.7)53.8 (14.3)<0.001
    gender (% female)101060.846.043.20.021
    race (% white)101056.867.469.00.049
    employment (% working)10092.713.414.90.008
Clinical
    dialysis modality (% hemodialysis)101066.272.578.30.037
    smoking status (% ever smoker)95156.157.465.80.031
    ICED score (%)1008
        ≤127.436.036.10.031
        226.034.836.1
        346.629.227.9
    diabetes (% diabetic)100857.552.757.00.373
    history of CVD (% positive)100753.445.341.00.110
    late referral (% <4 mo)80736.532.325.00.052
    BMI (kg/m2; mean [SD])94727.4 (8.2)26.8 (6.5)27.4 (6.7)0.347
    Kt/V (mean [SD])c5821.35 (0.32)1.29 (0.29)1.22 (0.30)0.003
    baseline access (% catheter)c50864.768.563.70.536
    statin use (%)101014.914.013.30.917
    vitamin D use (%)42417.510.518.60.068
    nonadherence (%)7284.47.911.70.126
Laboratory
    albumin (g/dl; mean [SD])10063.56 (0.30)3.62 (0.38)3.63 (0.38)0.309
    calcium (mg/dl; mean [SD])10098.99 (0.64)9.09 (0.66)9.02 (0.80)0.245
    hemoglobin (g/dl; mean [SD])100111.1 (1.4)10.8 (1.3)10.7 (1.3)0.036
    creatinine (g/dl; mean [SD])10056.07 (2.47)6.69 (2.14)8.31 (2.70)<0.001
    CRP (mg/dl; median [IQR])8560.5 (0.3 to 1.5)0.4 (0.2 to 0.7)0.4 (0.2 to 1.1)0.282
    PTH (pg/ml; median [IQR])665125 (63 to 243)151 (69 to 291)176 (86 to 361)0.044
  • a BMI, body mass index; CRP, C-reactive protein; CVD, cardiovascular disease; ICED, Index of Coexistent Disease; IQR, interquartile range; PTH, parathyroid hormone.

  • b By Pearson χ2 or ANOVA.

  • c Hemodialysis patients only.