Table 3.

Distribution of events, by quartiles of serum phosphorus, calcium, and calcium-phosphorus producta

Composite End PointESRDDoubling of Serum Creatinine
All258 (26.1)210 (21.3)48 (4.8)
PO4 (mg/dl)
    <3.340 (15.6)31 (12.1)9 (3.5)
    3.3–3.854 (18.8)40 (13.9)14 (4.8)
    3.81 to 4.360 (26.9)50 (22.4)10 (4.4)
    >4.3104 (47.2)89 (40.4)15 (6.8)
Ca (mg/dl)
    <9.182 (34.8)71 (30.2)11 (4.6)
    9.1 to 9.451 (23.3)40 (18.3)11 (5.0)
    9.41 to 9.762 (24.6)51 (20.2)11 (4.3)
    >9.763 (22.5)48 (17.1)15 (5.3)
Ca × PO4 (mg2/dl2)
    <3035 (18.0)30 (15.4)5 (2.5)
    30 to 3539 (15.6)28 (11.2)11 (4.4)
    36 to 4068 (25.0)53 (19.4)15 (5.5)
    >40116 (42.9)99 (36.6)17 (6.3)
  • a Data are n (% of total).\