Epidemiology of inflammatory bowel disease in racial and ethnic migrant groups

Table 3 Prevalence of ulcerative colitis: Study characteristics and comparison between population groups

Study characteristics									Study quality characteristics
Study	Country (region)	Study period	Number of cases	Prevalence rate, cases/100000					Diagnosis based on recognised criteria	Ethnicity reporting method	Sample frame
				SA	Asian	Caucasian	Black	Hispanic
Probert (1993)[18]	United Kingdom (Leicester)	1989	888	136.0	-	90.8	-	-	Yes	Self-reported	Population
Wang (2013)[20]	United States (National database)	1996-2007	108	-	40.0	89.0	25	35	No	Self-reported	Population
				SA	Malay	Chinese	Black	Hispanic
Lee (2000)[21]	Singapore (Singapore)	1985-1996	58	16.2	7.0	6.0	-	-	Yes	Self-reported	Hospital

SA: South Asian.