Table 3.

Environmental risk factors for inflammatory bowel disease

Variables	Group			P
	n=329	CD (n=212)	UC (n=117)
Oral contraceptive pill	33 (10.0)	19 (9.0)	14 (1.0)	0.385
Anti-inflammatory	99 (30.1)	65 (30.7)	34 (29.1)	0.762
Smoking	51 (15.5)	37 (175)	14 (12.0)	0.188
Family influence	59 (17.9)	38 (17.9)	21 (18.0)	0.996
Appendectomy	32 (9.7)	21 (9.9)	11 (9.4)	0.883
Tonsillectomy	22 (6.7)	13 (6.1)	9 (7.7)	0.588

Notes: Data are presented as n (%).

Abbreviations: CD, Crohn’s disease; UC, ulcerative colitis.