Table 1.
Main characteristics of ulcerative colitis in non-appendicectomised and appendicectomised patients
| Non-appendicectomised | Appendicectomised | p Value | |
| No of patients | 589 | 49 | |
| Female gender | 304 (52%) | 36 (73%) | 0.003 |
| Age at diagnosis (y) | 32.9 (14.4) | 35.7 (15.6) | NS |
| Duration of disease (y)* | 7.2 (8.3) | 10.1 (8.1) | 0.02 |
| Disease onset after 1995 | 155 (26%) | 12 (24%) | NS |
| Familial history | 62 (10%) | 4 (8%) | NS |
| Caucasian ethnicity | 433 (74%) | 40 (82%) | NS |
| Cigarette smoking | |||
| Never | 332 (56%) | 29 (59%) | NS |
| Latter | 8 (1%) | 1 (2%) | NS |
| Previous | 145 (25%) | 13 (27%) | NS |
| Current | 104 (18%) | 6 (12%) | NS |
| Oral contraceptive use | 75 (38%) | 5 (22%) | NS |
| Extraintestinal manifestations | 121 (21%) | 10 (20%) | NS |
*At last visit or when censored.