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Fig. 1D —Time evolution of markers of glomerular filtration rate in each patient. Thick horizontal lines indicate mean concentrations, vertical lines indicate 95% CI, and dotted lines indicate patients with missing data. Graphs show cystatin C level after CT in N-acetylcysteine (C) and control (D) groups. Dashed line indicates maximum normal value of cystatin C (1.55 mg/L). Triangles indicate patients in whom cystatin C values were not obtained at both day 2 and day 4.