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Fig. 6. —Graph shows difference between single-kidney glomerular filtration rates (GFR) as measured with CT and with excretory clearance versus their means. Dashed line represents mean difference (D=4.1 mL/min), and solid line represents limits of agreement (SD = 2.8 mL/min). Kidney conditions are indicated by following symbols: {blacksquare} = no disease, • = untreated hydronephrosis, {blacktriangleup} = hydronephrosis and percutaneous nephrostomy (PCN), {blacktriangledown} = pyelonephritis, {diamondsuit} = pyelonephritis and PCN, + = pyelonephritis and hydronephrosis.