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Receiver operating characteristic (ROC) curves demonstrate that non-invasive indices predict improvement accurately. ROC curves for the simple clinical colitis activity index (SCCAI) (A), the Seo index (B), and the inflammatory bowel disease quality of life index (IBDQ) (C) for the end point of improvement are presented. Areas under the ROC curves were 0.84, 0.82, and 0.82, respectively.
