Table 2.

Biochemical characteristics of the study population

Biochemical MarkerAll (n = 139)Serum ISP Value
1st Tertile (n = 46)2nd Tertile (n = 46)3rd Tertile (n = 47)
Calcium (mMol/L)2.29 ± 0.182.30 ± 0.182.32 ± 0.162.25 ± 0.210.142
Phosphate (mMol/L)1.28 ± 0.441.11 ± 0.36a1.31 ± 0.331.41 ± 0.550.003
iPTH (pg/ml) (median)137 ± 138 (80)66 ± 52ab (46)128 ± 99c (112)213 ± 183 (161)<0.0001
Albumin (g/L)37 ± 638 ± 738 ± 636 ± 50.135
C-reactive protein (mg/L) (median)10.7 ± 23 (3.4)8.7 ± 19 (2.1)9.1 ± 12 (4.1)15 ± 33 (4.0)0.146
Hemoglobin (g/L)12 ± 1.712.7 ± 1.6a12 ± 1.711.6 ± 1.70.005
GFR-epid (ml/min/1.73m2)37 ± 2247 ± 19ab26 ± 1014 ± 6<0.0001
Total cholesterol (mMol/L)4.9 ± 1.15.0 ± 1.15.0 ± 1.15.0 ± 1.30.844
LDL cholesterol (mMol/L)2.7 ± 0.92.7 ± 0.82.7 ± 0.82.6 ± 1.00.814
Triglycerides (mMol/L)2.0 ± 1.31.74 ± 0.782.08 ± 1.692.32 ± 1.280.114
IS (mg/100 ml) (median)0.88 ± 0.98 (0.37)0.17 ± 0.06 (0.17)0.42 ± 0.13 (0.38)2.11 ± 0.93 (1.90)
  • Data are expressed as means ± SD and sometimes (median) for variables with a non-Gaussian distribution.

  • a P < 0.05 for 1st tertile versus 3rd tertile.

  • b P < 0.05 for 1st tertile versus 2nd tertile.

  • c P < 0.05 for 2nd tertile versus 3rd tertile.

  • d Calculated for patients at CKD stages 2 to 5 (n = 95).