tokens: The mean change in the creatinine concentration from day 0 to day 7 was 0 . 07 mg per deciliter in the iodixanol group and 0 . 24 mg per deciliter in the iohexol group ( P = 0 . 003 ; value in the iodixanol group minus the value in the iohexol group , - 0 . 17 mg per deciliter [ 95 percent confidence interval , - 0 . 34 to - 0 . 07 ] ) .