Ulcerative Colitis Clinical Trials

• Participants with Ulcerative Colitis (UC) provided written consent to participate in the study

• Participants who are aged ≥ 18 years at the earlier date of either initiation of treatment with ozanimod or azathioprine or obtaining consent

• Starting dose of oral steroid ≥ 30 mg/day (prednisolone equivalent)

• Administration of ozanimod or azathioprine started after oral steroid administration, and ozanimod or azathioprine administered concomitantly with steroids (excluding patients who started oral steroids and ozanimod or azathioprine on the same day)

• In the ozanimod group, patients with notable clinical symptoms due to the primary disease (rectal bleeding subscore ≥ 1 point or total PRO2 score ≥ 2 points) remained at the start of ozanimod administration

• In the azathioprine group, patients who started azathioprine treatment after February 2019