(A) Relation between ePTFp and serum FGF23 levels in 148 CKD patients at various stages. The threshold values of ePTFp and FGF23 were indicated. (B) Patients participated in the EMPATHY study were stratified into two groups by 53 pg/ml of FGF23 and the cumulative incidence of renal events were compared. Modified from [12].