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Elevation of creatinine above the upper limit of normal in oral sodium phosphate (A) and polyethylene glycol (B) groups developing renal insufficiency. The magnitude of the change in creatinine concentration in both groups was small and insignificant (13.9 μmol/L versus 10.3 μmol/L in the oral sodium phosphate and polyethylene glycol groups, respectively; P=0.403)
