PTH and chronic kidney disease: Compared to the patients in quartile 1, more of those in quartile 4 were female, and they had higher prevalence rates of diabetes mellitus and hypertension, higher systolic blood pressure, higher CTR, higher levels of triglycerides and total cholesterol, lower total calcium, higher phosphorous, higher calcium-phosphorous product, higher PTH, higher UPCR, lower hemoglobin, lower baseline eGFR, higher prevalence of advanced CKD stage and higher percentage of calcium-based phosphate binders use.