Age and levels of creatinine, blood urea nitrogen, ferritin, chloride, phosphate, intact-parathyroid hormone (PTH), and FGF-23 were significantly and positively correlated with f(HNA) in our CKD patients (ρ = 0.302, p < 0.001; ρ = 0.410, p < 0.001; ρ = 0.457, p < 0.001; ρ = 0.286, p = 0.002; ρ = 0.230, p = 0.015; ρ = 0.265, p = 0.006; ρ = 0.357, p < 0.001; ρ = 0.420, p < 0.001, respectively) (Table 2, Fig. 1). Here, PTH is linked to chronic kidney disease.