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Protective effect of appendectomy on the development of ulcerative colitis: matched, case-control study
B Dijkstra1, P F Bagshaw, F A Frizelle
1University Department of Surgery, Christchurch Hospital and Medical School, New Zealand.
Diseases of the Colon and Rectum
|May 1, 1999
Summary
Appendectomy significantly reduces the risk of developing ulcerative colitis, even when controlling for cigarette smoking. This protective effect suggests potential immunological mechanisms at play.
Area of Science:
- Gastroenterology
- Immunology
Background:
- Appendectomy and cigarette smoking are hypothesized to influence ulcerative colitis risk.
- Previous research suggests a potential protective role for appendectomy.
Purpose of the Study:
- To investigate the association between appendectomy and ulcerative colitis incidence.
- To determine the relative appendectomy rates in ulcerative colitis patients versus controls, controlling for smoking.
Main Methods:
- A case-control study design was employed.
- Patients with ulcerative colitis were compared to controls from an orthopedic outpatient clinic.
- Matching criteria included age, gender, and cigarette smoking status.
Main Results:
- The ulcerative colitis group showed a lower appendectomy rate (8%) compared to the control group (21%).
- This difference was statistically significant (P = 0.018).
- An odds ratio of 3.5 indicated a protective effect of appendectomy.
Conclusions:
- Appendectomy demonstrates a protective effect against ulcerative colitis development, independent of smoking status.
- The findings support the hypothesis that appendectomy reduces ulcerative colitis risk.
- An immunological basis for this protective association is proposed.