The purpose of this retrospective observational cohort study is to assess pregnancy and infant outcomes in three groups: the first is women with ulcerative colitis (UC) who were exposed to ozanimod during pregnancy; the second is women with UC exposed to conventional therapy during pregnancy; the third is women with UC exposed to advanced therapy during pregnancy. This study will use data from a large US healthcare claims database.

Inclusion Criteria:

• Age 18 to 49 years on date of conception
• Date of conception between June 1, 2021 and September 1, 2030
• Continuous medical and pharmacy coverage for a minimum of 6 months prior to date of last menstrual period through the end of the pregnancy episode
• Diagnosis of UC during the 12 months prior to conception through the end of the first trimester

Exclusion Criteria:

• • Pregnancies exposed to any known teratogens and the exposure falls within the period of 5 half-lives prior to the estimated date of conception through the end of the first trimester (assessed via the presence of national drug codes or medical procedure codes)

Adult women with UC who became pregnant between June 1, 2021 and September 1, 2030