Table 2.

Biochemical characteristics of the study population

Biochemical Marker	All (n = 139)	Serum IS			P Value
		1st Tertile (n = 46)	2nd Tertile (n = 46)	3rd Tertile (n = 47)
Calcium (mMol/L)	2.29 ± 0.18	2.30 ± 0.18	2.32 ± 0.16	2.25 ± 0.21	0.142
Phosphate (mMol/L)	1.28 ± 0.44	1.11 ± 0.36a	1.31 ± 0.33	1.41 ± 0.55	0.003
iPTH (pg/ml) (median)	137 ± 138 (80)	66 ± 52ab (46)	128 ± 99c (112)	213 ± 183 (161)	<0.0001
Albumin (g/L)	37 ± 6	38 ± 7	38 ± 6	36 ± 5	0.135
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 ± 1.7	12.7 ± 1.6a	12 ± 1.7	11.6 ± 1.7	0.005
GFR-epid (ml/min/1.73m2)	37 ± 22	47 ± 19ab	26 ± 10	14 ± 6	<0.0001
Total cholesterol (mMol/L)	4.9 ± 1.1	5.0 ± 1.1	5.0 ± 1.1	5.0 ± 1.3	0.844
LDL cholesterol (mMol/L)	2.7 ± 0.9	2.7 ± 0.8	2.7 ± 0.8	2.6 ± 1.0	0.814
Triglycerides (mMol/L)	2.0 ± 1.3	1.74 ± 0.78	2.08 ± 1.69	2.32 ± 1.28	0.114
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.

^aP < 0.05 for 1st tertile versus 3rd tertile.

^bP < 0.05 for 1st tertile versus 2nd tertile.

^cP < 0.05 for 2nd tertile versus 3rd tertile.

^dCalculated for patients at CKD stages 2 to 5 (n = 95).