Table 5. Simple linear correlations between both FGF23 molecules and other demographic, clinical and CKD-MBD parameters (n = 150).

Variable	ln-iFGF23		ln-cFGF23
	r	P*	r	P*
ln-cFGF23 a	0.70	<0.001	——	——
Age (years)	-0.25	<0.01	-0.26	<0.01
Dialysis vintage (Months)b	-0.02	0.74	0.21	<0.01
Hb (g/L) c	0.05	0.49	-0.01	0.86
TSAT (%) d	-0.05	0.49	-0.04	0.58
Ferritin (ng/L)	-0.04	0.58	0.02	0.79
ln-CRP (mg/L) e	0.33	<0.001	0.53	<0.001
iCa (mEq/L) f	0.03	0.70	-0.14	0.07
P (mg/dL) g	0.61	<0.001	0.55	<0.001
ln-iPTH (pg/mL) h	0.29	<0.001	0.29	<0.001
25(OH)D (ng/mL) i	-0.06	0.44	-0.15	0.05
1,25 (OH)2 D (pg/mL) j	0.03	0.67	0.06	0.46

^a ln-cFGF23, C-terminal Fibroblast Growth Factor

^b Dialysis Vintage, Time since the initiation of dialysis

^c Hb, Hemoglobin levels

^d TSAT, Transferrin Saturation

^e ln-CRP, C Reactive Protein

^f iCa, Serum Ionized Calcium

^g P, Serum Phosphate

^h ln-PTH, Intact Parathyroid Hormone

ⁱ 25 (OH)D, 25 Hydroxyvitamin D (calcidiol)

^j 1,25 (OH)₂D, 1,25 Dihydroxy vitamin D (calcitriol).

The Spearman correlation test was used for all comparison.

- To convert iCa in mEq/L to mmol/L, multiply by 0.5.

* P-value.