Spearman correlation analysis of anthropometric parameters, body composition indices and laboratory data with serum intact parathormone (iPTH) in chronic kidney disease (CKD) stage 3 patients and with 6-month mean iPTH and alfacalcidol index [(mcg/week per pg/ml of PTH) × 1,000] in CKD stage 4,5D patients. The gene discussed is PTH; the disease is chronic kidney disease.