FGF23 and anemia: In the fully adjusted model, the risk of developing anemia was significantly higher in the third (HR, 1.66; 95% CI, 1.11–2.47; P = 0.01) and fourth (HR, 1.84; 95% CI, 1.23–2.76; P = 0.003) quartile of FGF23 compared with the first quartile.