Table 1 Demographic and clinical characteristics of individuals with Crohn's disease (CD), ulcerative colitis (UC), indeterminate colitis (IC), and controls.

	CD (n = 496)	UC (n = 512)	IC (n = 96)	Controls (n = 750)
Median age at diagnosis (y)	26	36	31
Median duration follow up (y)	13.2	12.9	12.1
Sex (F:M)	331:163	238:272	63:33	430:330
Smoking at diagnosis (%)
Never	44.3	52.6	47.9	72.0%
Ex	12.9	34.5	30.2
Current	42.8	12.9	17.9
Jewish ancestry (%)	1.3	0.8	0.8
Family history of IBD (%)	24.2	21.5	21.9
Resectional surgery (%)	50.8	15.8	6.3
Location/extent (%)	29.8 ileal	50.5 extensive
	30.0 colonic	14.7 <splenic
	37.3 ileocolonic	34.8 <sigmoid
	25.6 perianal
Behaviour (%)
Stenosing	36.1
Penetrating	23.4

IBD, inflammatory bowel disease.