Variable
N
Event
Rate#
Crude HR (95% CI) Adjusted HR (95% CI)
Ulcerative colitis
Non- appendectomy 246562 49 2.77 1.00 1.00
Appendectomy
Without appendicitis 21996 19 13.4 4.81(2.83, 8.16)*** 3.19(1.86, 5.50)***
With appendicitis 224566 97 6.08 2.19(1.55, 3.09)*** 2.11(1.49, 2.98)***
Crohn’s disease
Non- appendectomy 246562 38 2.15 1.00 1.00
Appendectomy
Without appendicitis 21996 21 14.8 6.77(3.97, 11.5)*** 6.13(3.54, 10.6)***
With appendicitis 224566 118 7.39 3.43(2.38, 4.95)*** 3.24(2.24, 4.68)***