Associations between VDR polymorphisms, serum 25OHD/1,25OHD levels, their interactions, and CKD stages were computed with a multiple ordered logistic regression model after adjustment for possible confounders including disease duration, calendar month, use of ACEI/ARB, use of statins, and levels of Ca, P, and iPTH (Table 2). This evidence concerns the gene VDR and chronic kidney disease.