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Serial changes in the endoscopic score before and after indigo naturalis initiation. A: The Mayo endoscopic subscore significantly improved from 2 (2-3) to 1 (1-2) [median (IQR); t-test, p=0.005]. B: The Rachmilewitz endoscopic index significantly improved from 7 (5.5-11) to 3 (1-7) [median (IQR); t-test, p=0.008]. C: The ulcerative colitis endoscopic index of severity significantly improved from 3 (3-4.5) to 1 (0.5-3.5) [median (IQR); t-test, p=0.039].
