Objective-To determine the extent to which chronic kidney disease mineral bone disorder (CKD-MBD) is associated with HRQOL among incident dialysis patients.
Design-Cross-sectional analysis
Setting-United States Renal Data System Dialysis Morbidity and Mortality Study (DMMS), Wave 2Patients-2590 adult participants in DMMS Wave 2 for whom quality of life and laboratory data were available Methods-We stratified patients according to their serum concentrations of phosphorus, calcium, and parathyroid hormone (PTH) and compared HRQOL as a function of these indicators in analyses adjusted for demographic, clinical, and other laboratory variables. Results-Both high and low serum phosphorus concentrations were associated with lower PCS (−1.25 to −1.48 points compared to the reference category), as was low PTH (−1.49 points). Low serum phosphorus was associated with more severe symptoms of kidney disease (−3.88 points) but there were no associations between high phosphorus or either extreme of PTH and the Symptom score. Serum calcium concentration and the calcium × phosphorus product were unassociated with PCS or Symptom scores. There were no associations among phosphorus, calcium, or PTH and MCS. Analyses simultaneously controlling for serum phosphorus, calcium, and PTH showed similar results.
Main Outcome Measures-PhysicalConclusions-High and low serum phosphorus and low PTH are associated with slightly poorer self-reported physical functioning. Clinical trials will be necessary to determine whether and to what extent improvement in health status may occur with correction of selected disorders of mineral metabolism.