Table 4.

Factors associated with FePO4: Bivariate and multivariate regression analyses using FePO4 as the dependent variable

Independent Variablesβ CoefficientSEtPy InterceptR2
Bivariate models
    FGF-23
        log FGF-23 (per log RU/ml)9.881.646.02<0.001−21.960.32
    covariates
        log iPTH (per log pg/ml)11.491.776.50<0.001−22.920.35
        eGFR (per ml/min per 1.73 m2)−0.410.06−7.01<0.00145.310.38
        Serum phosphate (per mg/dl)6.272.162.910.0057.520.10
Multivariate models
    FGF-23 and iPTH
        log FGF-23 (per log RU/ml)6.691.604.15<0.001−43.730.47
        log iPTH (per log pg/ml)8.371.784.72<0.001
    FGF-23 and serum phosphate
        log FGF-23 (per log RU/ml)9.791.974.97<0.001−22.160.32
        serum phosphate (per mg/dl)0.192.250.080.935
    iPTH and serum phosphate
        log iPTH (per log pg/ml)10.621.815.87<0.001−30.910.38
        serum phosphate (per mg/dl)3.291.871.760.082
    full multivariate model
        log FGF-23 (per log RU/ml)5.211.952.670.009−15.190.50
        log iPTH (per log pg/ml)6.042.042.950.004
        eGFR (per ml/min per 1.73 m2)−0.180.08−2.200.031
        serum phosphate (per mg/dl)−1.001.97−0.500.615