Narrow band imaging and white light endoscopy in the characterization of a polypectomy scar: A single-blind observational study

Figure 3 Receiver operating characteristic curve. Global assessment of white light endoscopy (WLE) and narrow band imaging (NBI) is drawn for each group. A: WLE-NBI; B: NBI-WLE. The cut-off of the best area under the operating characteristic curve (ROC) curve is the true positive rate (sensitivity) plotted to the false positive rate (1.0-specificity). The closer the ROC curve to the upper left corner, the higher the accuracy of the test.