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Figure 1 Serum creatinine concentration at baseline (solid bar) and at 48 h (open bar) after contrast dye administration in patients treated with acetylcysteine and hydration (Acetylcysteine Group) and in those treated with hydration alone (Control Group). Brackets represent the standard deviation. There was no statistically significant interaction between the changes in the serum creatinine concentration from baseline and the treatment strategy (F = 0.026, p = 0.87) by the two-way analysis of variance for repeated measures.