Table 4.

Cox proportional hazards analysis of risk of colectomy

Variables	Hazard ratio	95% CI	P-value
Prior anti-TNF exposure	0.838	0.244 to 2.880	.78
CRP at admission	1.001	0.993 to 1.009	.74
Mayo 3 findings on endoscopy	1.003	0.231 to 4.362	.74
Time to flexible sigmoidoscopy, days	1.160	1.053 to 1.276	.002
Oral steroids on admission	3.693	1.106 to 12.322	.034

Abbreviations: 95% CI, 95% confidence interval; anti-TNF, anti-tumor necrosis factor; CRP, C-reactive protein.

Bold values indicate P-value <.05.