Table 2. Patient characteristics by serum calcium categorya

<8.0 mg/dl (n = 2325)8.0–8.5 mg/dl (n = 4594)8.5–9.0 mg/dl (n = 10,451)9.0–9.5 mg/dl (n = 10,759)9.5–10.0 mg/dl (n = 6712)10.0–10.5 mg/dl (n = 3652)10.5–11.0 mg/dl (n = 1478)≥11.0 mg/dl (n = 567)P Value
a Values are means, medians presented for vintage and ferritin. P values for proportions and means are age-adjusted.
Age (years)52.358.460.561.662.161.961.262.3<0.0001
Gender (% female)39%41%46%50%53%56%54%60%<0.0001
Race/ethnicity (%)<0.0001
    white23%31%37%40%40%43%41%41%
    black53%44%43%42%42%40%41%37%
    Hispanic20%21%17%15%13%13%13%18%
    other4%4%3%3%4%4%5%4%
Diabetes (%)39%49%50%48%44%41%38%40%<0.0001
Vintage (years)2.51.92.02.42.52.52.52.5<0.0001
Weight (kg)75.473.572.572.471.670.569.669.9<0.0001
Quetèlet’s (body mass) index (kg/m2)27.326.926.726.826.526.125.925.9<0.0001
Bicarbonate (mEq/L)19.020.020.721.221.621.922.422.5<0.0001
BUN (mg/dl)6661595859585755<0.0001
Creatinine (mg/dl)11.49.99.39.39.79.79.89.1<0.0001
Albumin (g/dl)3.963.923.863.833.843.843.793.66<0.0001
Cholesterol (mg/dl)165169171172172172170171<0.0001
Hemoglobin (g/dl)10.310.410.410.510.510.510.510.3<0.0001
Ferritin (μg/L)349367415415445455484488<0.0001
URR (%)66.2%67.5%68.2%68.9%69.6%69.8%69.6%70.0%<0.0001