Frequencies and percentages of patients in each stage of kidney disease before and after contrast administration, as determined by estimated glomerular filtration rates.

Data are presented as n (%). GFRs are in ml/min/1.73m2. Stage 1 = kidney injury with normal or increased GFR, 2 = slight decrease in GFR, 3 = moderate decrease in GFR, 4 = severe decrease in GFR, 5 = renal failure. GFR = glomerular filtration rate, MDRD = Modification of Diet in Renal Disease, CG = Cockroft-Gault. Frequencies and percentages of patients in each stage of kidney disease before and after contrast administration, as determined by estimated glomerular filtration rates.