tokens: From day 0 to day 3 , the mean peak increase in creatinine was 0 . 13 mg per deciliter in the iodixanol group and 0 . 55 mg per deciliter in the iohexol group ( P = 0 . 001 ; the increase with iodixanol minus the increase with iohexol , - 0 . 42 mg per deciliter [ 95 percent confidence interval , - 0 . 73 to - 0 . 22 ] ) .