Characteristics of the 202 patients who had an appendicectomy after their first admission for ulcerative colitis or haemorrhagic proctitis (UC), and 808 reference subjects matched for age, sex, and time of onset. Subjects were identified in the Danish National Patient Registry, January 1981 to December 1999
| Patients with appendicectomy (n = 202) | Reference subjects (n = 808) | |
|---|---|---|
| *Values are mean (SD). | ||
| Men (n) | 84 (42%) | 336 (42%) |
| Age at UC onset (y)* | 38.6 (18.0) | 38.7 (17.7) |
| Age at appendicectomy/index date (y)* | 43.3 (17.8) | 43.4 (17.6) |
| Follow up after UC onset (y)* | 10.77 (5.2) | 10.99 (5.1) |
| Before appendicectomy/index date | 4.72 (4.3) | 4.72 (4.3) |
| After appendicectomy/index date | 6.05 (4.7) | 6.26 (4.7) |
| No of UC admissions | 288 | 1055 |
| Before appendicectomy/index date | 171 (59%) | 631 (60%) |
| After appendicectomy/index date | 117 (41%) | 424 (40%) |
| Incidence of UC admissions (per year) | ||
| Before appendicectomy/index date | 0.1793 | 0.1654 |
| After appendicectomy/index date | 0.0958 | 0.0838 |