Prevention of post-operative recurrence of Crohn’s disease

Table 1 Risk factors for postoperative recurrence

Risk factor	Strength of association (OR)	Grade of evidence1
Active smoking	2 (1.3-3.4)[18]	B
Penetrating disease	1.5 (1.2-1.9)[26]	B
Prior resection	1.8 (1.1-2.9)[22]	B
Myenteric plexitis	1.9 (1.0-3.5)[33]	C

¹Based on American Gastroenterological Association guidelines. A: Multiple, well-designed randomized controlled trials; B: At least one large well-designed clinical trial with or without randomization; C: Based on clinical experience, expert committees or descriptive studies.