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Figure 4 Regression of induced urine flow rate predicting resultant change in serum creatinine from baseline to that measured at 48 h in mg/dl, controlling for baseline renal function (to convert from mg/dl to µmol/liter, multiply by 88.4). This shows a relation between increasing urine flow rates in the first 24 h after contrast exposure and reduction in renal injury measured at 48 h that is independent of baseline renal function in all 98 aggregated participants, r = –0.36; F = 5.73; p = 0.005. Urine flow rate (ml/h), beta = –0.36; t = –3.33; p = 0.001. Baseline CrCl (ml/min), beta = 0.10; t = 0.93; p = 0.36.