Table 5

Effect of previous appendicectomy and current smoking on medical therapeutic needs during the course of ulcerative colitis

Non-appendicectomisedAppendicectomised
Non-smokersSmokersNon-smokersSmokers
*Significantly different (p<0.05) from non-appendicectomised non-smoker group.
n48510443 6
Duration of disease (y) 6.8 (8.1) 7.7 (7.7) 9.7 (7.0) 8.2 (5.5)
No requiring oral glucocorticoids345 6530 1
    Per cent 71 627017
    Relative risk 0.88 0.98 0.23
    95% CI 0.75–1.03 0.80–1.20 0.04–1.40
No requiring intensive intravenous treatment211 3020 1
    Per cent 44 29*4717
    Relative risk 0.66 1.07 0.38
    95% CI 0.48–0.91 0.76–1.50 0.06–2.30
No requiring immunosuppressive therapy101 911 0
    Per cent 21 12*26 0
    Relative risk 0.42 1.23
    95% CI 0.22–0.79 0.72–2.10