Table 3.

Factors associated with serum phosphate: Bivariate and multivariate regression analyses using serum phosphate as the dependent variable

Independent Variablesβ CoefficientSEtPy InterceptR2
Bivariate models
    FGF-23
        log FGF-23 (per log RU/ml)0.480.085.72<0.0011.110.30
    covariates
        log iPTH (per log pg/ml)0.260.112.480.0152.420.07
        eGFR (per ml/min per 1.73 m2)−0.110.03−3.600.0015.650.31
        (eGFR)2<0.01<0.012.730.008
        (eGFR)3<0.01<0.01−2.300.024
Multivariate models
    FGF-23 and iPTH
        log FGF-23 (per log RU/ml)0.460.094.96<0.0010.990.30
        log iPTH (per log pg/ml)0.050.100.460.647
    full multivariate model
        log FGF-23 (per log RU/ml)0.290.112.770.0074.380.39
        log iPTH (per log pg/ml)−0.140.12−1.140.259
        eGFR (per ml/min per 1.73 m2)−0.100.03−2.900.005
        (eGFR)2<0.01<0.012.450.017
        (eGFR)3<0.01<0.01−2.170.033