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FIG 3. Receiver operating characteristic curves for detection of hairline residual lumen by readers 1 and 2. Area under the receiver operating characteristic curve for reader 1 (which correlates with accuracy) was 0.98 ± 0.03; for reader 2, this area was 0.91 ± 0.06. No significant difference was observed between the accuracy of the two readers (P = .28, two-tailed t test). Of note, at an operating point corresponding to 90% sensitivity, reader 1 achieved 95% specificity and reader 2 achieved 80% specificity. At an operating point corresponding to a sensitivity of 95%, specificity was reduced to approximately 90% for reader 1 and 75% for reader 2.
