Table 4. Analysis of risk factors for relapse.

Risk factor	Hazard ratio (95 % CI)	P value
Age	0.988 (0.956 – 1.021)	0.455
Sex (male)	1.056 (0.397 – 2.808)	0.914
Affected area		NS
Proctitis type (E1)	–	0.811
Left-sided type (E2)	0.744 (0.150 – 3.690)	0.717
Pancolitis type (E3)	1.248 (0.436 – 3.571)	0.680
Disease duration	1.000 (0.996 – 1.005)	0.876
Smoking rate	–	0.999
MES0 vs MES1	4.484 (1.474 – 13.642)	0.004
HH vs NHH	3.866 (1.497 – 9.982)	0.003
MES0 (HH vs NHH)	0.042 (0.000 – 66635)	0.502
MES1 (HH vs NHH)	3.744 (1.041 – 13.466)	0.030
HH (MES0 vs MES1)	1.640 (0.367 – 7.337)	0.512
Duration of remission before entry	1.110 (0.414 – 2.973)	0.836

CI, confidence interval; MES, Mayo endoscopic subscore; HH, histological healing; NHH, non-histological healing.