Indices of Renal Handling

Serum Phosphate			p-value
	< 2.5 (n=6)	2.5 to 4.5 (n=73)	p-value
FGF23 (RU/ml)	52.3 (IQR = 31.8 to 75.3)	48.6 (IQR= 32.3 to 81.6)	0.988
TmP/GFR (mg/dl)	2.1 ± 0.22	3.1 ± 0.47	0.000^***
Dietary Phosphate Intake (mg)	1174 ± 519	1219 ± 416	0.563
FePO₄ (%)	7.9 ± 4.1	9.1 ± 4.7	0.468
Serum Creatinine (mg/dl)	0.6 ± 0.2	0.8 ± 0.2	0.033^*

^*p-value<0.05
^***p-value<0.001
Groups were compared by using Mann-Whitney U test. There is significant difference between TmP/GFR and serum creatinine between the two groups. FGF-23, Fibroblast growth factor 23; TmP/GFR, Tubular maximum re-absorption of phosphorus per unit of GFR; PO₄, Phosphate; FePO₄, fractional excretion of Phosphate.

Table 2: Indices of Renal Handling, Dietary Phosphate Intake and FGF-23 In Subjects With Low and Normal Serum Phosphate Levels (n=79).