FGF23 and hyperphosphatemia: When these variables were included in the multivariate Cox regression analysis, FGF‐23 >528 pg/mL (HR, 5.66; 95% CI, 1.24‐25.81; P = .03), UN >29.2 mg/dL (HR, 6.31; 95% CI, 1.20‐33.10; P = .03), and time between re‐examination visits (HR, 0.91; 95% CI, 0.87‐0.95; P < .001) were significantly associated with risk of hyperphosphatemia (Table 3).