PPARD and chronic kidney disease: When those with PPARD T-842C T/T (rs2267668) were defined as reference, those with PPARD T-842CT/C and C/C demonstrated the OR for CKD of 1.26 (95%CI 1.04–1.53) and 1.31 (95%CI 0.83–2.06), respectively, with the significant trend for increased OR with the increasing number of C allele (P = 0.018).