Table 4.

Multivariate linear regression analyses

Predictors	Univariate model			Backward multivariate model
	B coefficient	95% confidence interval	P-value	B coefficient	95% confidence interval	P-value
Dependent: Ln-sKl
Age	−0.005	−0.016–0.005	0.321	−0.009	−0.016 to − 0.002	0.013
eGFR	0.003	−0.003–0.009	0.329
BMI	−0.005	−0.023–0.014	0.638
Ln-PTH	0.028	−0.252–0.196	0.806
Ln-iFGF-23	0.199	−0.062–0.460	0.134
sPi	−0.049	−0.629–0.531	0.867
Ln-25(OH)D	−0.144	−0.388–0.100	0.243
24-h TmP/GFR	0.567	0.154–0.979	0.008	0.618	0.293–0.943	<0.001
Dependent: Ln-iFGF-23
Age	−0.001	−0.009–0.008	0.846
eGFR	−0.008	−0.014 to − 0.002	0.012	−0.009	−0.013 to − 0.005	<0.001
Ln-sKl	0.044	−0.12–0.208	0.594
Ln-PTH	0.15	−0.019–0.319	0.081	0.166	0.004–0.329	0.045
Serum phosphate (sPi)	0.637	0.106 to 1.167	0.019	0.524	0.111–0.937	0.014
Ln-24-h FEPi	0.164	−0.132–0.46	0.274
Dependent: 24-h TmP/GFR
Age	0.006	0.001–0.011	0.020	0.005	0.000–0.009	0.03
eGFR	0.001	−0.002–0.004	0.375
BMI	−0.008	−0.017–0.000	0.063	−0.009	−0.018–0.000	0.054
Ln-sKl	0.124	0.031–0.217	0.009	0.131	0.04–0.222	0.005
Ln-iFGF-23	−0.088	−0.210–0.033	0.153	−0.11	−0.221–0.001	0.052
Ln-PTH	−0.124	−0.224 to − 0.024	0.016	−0.143	−0.234 to − 0.052	0.002
Serum phosphate (sPi)	0.643	0.397–0.889	<0.001	0.641	0.395–0.886	<0.001
Dependent: Ln-24-h UPE
Age	0.002	−0.008–0.011	0.742
eGFR	0.005	−0.001–0.011	0.093	0.005	0.002–0.009	0.001
Ln-sKl	−0.246	−0.431–0.061	0.010	−0.255	−0.437 to − 0.072	0.007
Ln-iFGF-23	0.144	−0.087–0.376	0.219
Ln-PTH	−0.144	−0.338–0.05	0.145
Serum phosphate (sPi)	−1.193	−1.724 to − 0.662	<0.001	−1.158	−1.666 to − 0.65	<0.001