Table 4.

Predictors of colectomy according to multivariate Cox analysis

	Adjusted relative risk	95% CI	p Value
Current smoking	0.60	0.40–0.95	0.03
Previous appendicectomy	0.40	0.20–0.78	0.01
Left colon lesions	2.41	1.69–3.43	<0.001
Sigmoid lesions	1.69	1.05–2.70	0.03