In order to evaluate the association between secondary hyperparathyroidism and bone microstructural parameters, patients with CKD were divided into two groups according to the median concentration of intact PTH (179 pg/mL): high (n = 19, average = 311.5 pg/mL) and low (n = 20, average = 107.5 pg/mL). This evidence concerns the gene PTH and secondary hyperparathyroidism.