PTH and chronic kidney disease: In addition, Taylor J et al. [45] reported in 6531 subjects that lower UCaE was associated with a higher risk of developing CKD after adjusting for factors such as PTH and 1,25-dihydroxy vitamin D. Third, we did not investigate the associations between UCaE and mortality due to incomplete death records, so we cannot rule out the competitive risk of death for the progression of CKD.