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Prevalence of hyperphosphatemia, hyperparathyroidism, and increased plasma FGF23 according to GFR groups. Hyperphosphatemia is defined as phosphorus (Phos) z score>1.96 SD, hyperparathyroidism is defined as serum immunoreactive parathyroid hormone (iPTH) >65 pg/ml, and FGF23 excess is defined as plasma FGF23>101 RU/ml.
