Smoking increases the risk of extraintestinal manifestations in Crohn's disease

Table 2 Different extraintestinal manifestations at first diagnosis n (%)

	All patients n = 257	Crohn's disease	Ulcerative colitis	P value
Arthralgia	40 (16.3)	26 (17.8)	14 (14.6)	0.60
Arthritis	18 (7.3)	13 (8.9)	5 (5.2)	0.50
Ocular manifestation	5 (2.1)	2 (1.4)	3 (3.1)	0.63
Active sacroiliitis	12 (4.9)	11 (7.6)	1 (1.0)	0.06
Pyoderma gangrenosum	2 (0.8)	1 (0.7)	1 (1.0)	0.95
Erythema nodosum	7 (2.7)	7 (4.9)	0	0.002
PSC	1 (0.4)	0	1 (1.0)	0.4

PSC: Primary sclerosing cholangitis.