Epidemiology of inflammatory bowel disease in racial and ethnic migrant groups

Table 5 Crohn’s disease location and behaviour

Study	Country (Region)	Time period	Number of cases	Montreal classification	Population groups, %
					SA	Caucasian
Location
Walker (2011)[35]	United Kingdom (NW London)	2008-2010	309	L1	16.0	24.7
				L2	46.8	34.8
				L3	37.2	40.5
				L4	0.0	0.0
Goodhand (2012)[36]	United Kingdom (East London)	2010	141	L1	33.0	32.0
				L2	24.0	43.0
				L3	38.0	22.0
				L4	18.0	13.0
Li (2013)[22]	United States (San Francisco)	1994-2009	57 (Paed)	L1	7.7	14.9
				L2	38.5	23.4
				L3	53.9	61.7
				L4	15.4	5.3
Carroll (2016)[38]	Canada (British Columbia)	1997-2012	638 (Paed)	L1	6.0	9.0
				L2	55.0	35.0
				L3	39.0	55.0
				L4a	55.0	43.0
				L4b	1.0	9.0
				L4ab	0.0	8.0
Behaviour
Walker (2011)[35]	United Kingdom (NW London)	2008-2010	309	B1	72.3	58.1
				B2	22.0	60.0
				B3	4.3	14.0
				Perianal	20.2	21.4
Goodhand (2012)[36]	United Kingdom (East London)	2010	141	B1	63.0	55.0
				B2	15.0	11.0
				B3	20.0	15.0
				Perianal	16.0	3.0
Li (2013)[22]	United States (San Francisco)	1994-2009	57 (Paed)	Perianal	46.2	12.8
Carroll (2016)[38]	Canada (British Columbia)	1997-2012	638 (Paed)	B1	61.0	73.0
				B2	13.0	16.0
				B3	6.0	3.0
				B2B3	21.0	9.0

South Asians compared with Caucasians. Total No. of cases reported was 1145. Significant difference in disease behaviour illustrated in bold.