Table 2.

Simple linear correlations between the measured corrected TCa and clinical parameters of patients with CKD G4 + G5 (n = 1,922) and CKD G5D (n = 341)

Variable	CKD grade G4 + G5			CKD grade G5D
	mean ± SD	vs. measured corrected TCa		mean ± SD	vs. measured corrected TCa
		r	p		r	p
pH	7.32 ± 0.06	−0.18	<0.0001	7.36 ± 0.06	−0.03	0.56
HCO3–, mEq/l	21.8 ± 3.9	0.10	<0.0001	21.5 ± 3.8	0.13	0.02
Hb, g/dl	9.8 ± 1.6	0.32	<0.0001	9.5 ± 1.5	0.23	<0.0001
Total protein, g/dl	6.6 ± 0.8	0.26	<0.0001	6.2 ± 0.7	0.15	<0.01
Serum albumin, g/dl	3.6 ± 0.7	0.27	<0.0001	3.1 ± 0.6	0.15	<0.01
BUN, mg/dl	56.6 ± 22.4	−0.19	<0.0001	56.6 ± 20.4	−0.19	<0.0001
Creatinine, mg/dl	6.3 ± 3.2	−0.12	<0.0001	8.5 ± 3.1	0.20	<0.0001
Na, mEq/l	137.9 ± 3.9	0.10	<0.0001	136.1 ± 4.4	−0.05	0.37
K, mEq/l	4.7 ± 0.8	0.10	<0.0001	4.2 ± 0.8	−0.01	0.92
Cl, mEq/l	106.1 ± 5.4	0.11	<0.0001	102.9 ± 4.9	−0.10	0.06
TCa, mg/dl	8.55 ± 0.87	0.76	<0.0001	8.50 ± 1.10	0.83	<0.0001
P, mg/dl	4.8 ± 1.4	−0.30	<0.0001	4.7 ± 1.6	−0.19	<0.01