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. 2011 Jul 27;15(4):R178. doi: 10.1186/cc10327

Figure 2.

Figure 2

Receiver-operating characteristic (ROC) curve depicting the ability of the fractional excretion of urea (FeUrea) and urine/plasma (U/P) urea ratio to detect persistent AKI in the subgroup of patients with AKI. The ROC curve shows the relationship between the proportion of true positives (Sensitivity) and the proportion of false positives (1-Specificity) with various FeUrea and U/P urea ratio cutoffs. Diagonal segments are produced by ties. The area under the ROC curve is 0.59 (95% confidence interval, 0.49 to 0.70; P = 0.06) for FeUrea. The area under the ROC curve is 0.71 (95% confidence interval, 0.62 to 0.80; P = 0.04) for U/P urea ratio.