Table 2.

Multivariate analysis of factors predictive of colectomy in ulcerative colitis patients

Risk factor	Risk ratio	95%CI		P value
		Lower	Upper
Gender (male)	0.97	0.59	1.59	0.89
Age (> 40 yr)	1.13	0.70	1.82	0.61
Duration of disease (> 3 yr)	0.99	0.61	1.61	0.97
Severity (severe)	1.24	0.74	2.08	0.42
Extent of disease (total colitis)	1.21	0.68	2.23	0.51
CMV Ag (+)	0.64	0.36	1.13	0.12
Apheresis use	0.71	0.44	1.17	0.18
CNI use	1.11	0.63	1.92	0.73

CMV Ag: Cytomegalovirus antigenemia assay; CAI: Clinical activity index.