Table 1

Patient attrition

N (%)
Inclusion criteria
 ≥1 inpatient or ≥2 outpatient IBD claims from 30 October 2015 to 30 September 2019190 899
 Crohn’s disease diagnosis (>80% of claims for CD)102 188 (53.5)
 Continuous enrolment: 6 months before, 12 months after index date63 519 (62.2)
 Age ≥18 years59 062 (93.0)
Exclusion criteria
 No autoimmune disease55 767 (94.4)
 No IBD claims in the pre-index period44 501 (79.8)
 Total CD cohort44 501
FCD cohort
 ≥1 inpatient or ≥2 outpatient claims of FCD (on separate days)2769 (6.2)
  • CD, Crohn’s disease; FCD, fibrostenotic Crohn’s disease; IBD, inflammatory bowel disease.