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Fig. 3. —Graph shows correlation of total glomerular filtration rates (GFR) (•) between iopromide excretory clearance and plasma clearance in 18 patients. Correlation coefficient was r = 0.94, with regression line of y = -6 + 0.97 x x. (SD_yx = 11.4 mL/min). Solid line represents correlation line, and dashed line represents line of identity.