Figure 1

Resistance to FGF23-driven phosphaturia in CKD patients with severe abdominal aortic calcification. Linear regression models for the relationship between FEP and serum FGF23 (A), or serum PTH (B) or estimated GFR (C) in the three subgroups of CKD patients defined by their Kauppila Index (KI; Black: KI = 0, no calcification; Green: KI = 1 to 5, moderate calcification; Red: KI > 5, severe calcification) in the whole patient population (Left side panels) or in patients with estimated GFR under 30 ml/min (Right side panels).