Table 3. Open in new tab Multivariable...

Table 3.

Multivariable linear regression analysis: determinants of FGF-23 levels at onset of dialysis session

Model	Determinant	Standardized β	P-value	R²
1	Phosphate	0.484	<0.001	0.57
	Calcium	0.247	<0.001
	UFV	0.373	<0.001
2	Phosphate	0.480	<0.001	0.58
	Calcium	0.234	<0.001
	UFV	0.352	<0.001
	Age	–0.063	0.4
	Copeptin	0.076	0.3
	Kt/V	0.043	0.5
3	Phosphate	0.520	<0.001	0.62
	Calcium	0.253	<0.001
	UFV	0.343	<0.001
	RRF ≥1 mL/min	–0.091	0.2

Model	Determinant	Standardized β	P-value	R²
1	Phosphate	0.484	<0.001	0.57
	Calcium	0.247	<0.001
	UFV	0.373	<0.001
2	Phosphate	0.480	<0.001	0.58
	Calcium	0.234	<0.001
	UFV	0.352	<0.001
	Age	–0.063	0.4
	Copeptin	0.076	0.3
	Kt/V	0.043	0.5
3	Phosphate	0.520	<0.001	0.62
	Calcium	0.253	<0.001
	UFV	0.343	<0.001
	RRF ≥1 mL/min	–0.091	0.2

Model 1 is the optimal regression model that used least determinants to predict most of the variations in FGF-23 levels. Model 2 assessed the effect of all significant correlates from the univariable analysis. Model 3 assessed whether RRF may attenuate the results.

FGF-23, natural log-transformed fibroblast growth factor 23; Standardized β, standardized coefficient; UFV, ultrafiltration volume; RRF, residual renal function.

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