Table 1.

Characteristics of included studies on hospitalization risk in ulcerative colitis

Study	Country	Data Source	Study Span (Year)	Sample Size	Age Group	Sex (%)	Extent of Disease (%)	Time Intervals Reported (Years)	Type of Hospitalization
Burisch et al, 2018	Multiple European Countries	EPI-IBD	2010	717	Adults	M (55), F (45)	E1 (20), E2 (41), E3 (39)	1, 3, and 5	All-cause
Golovics et al, 2015	Hungary	Veszprem Province	2000 – 2010	347	-	M (58), F (42)	E1 (28), E2 (44), E3 (28)	1, 3, 5, and 10	UC-related
Jeuring et al, 2015	Netherlands	IBD-SL	1991 – 2010	1661	Adults	M (53), F (47)	E1 (34), E2 (48), E3 (18)	1, 2, 3, and 5	All-cause and UC-related
Niewiadomski et al, 2015	Australia	Barwon Area	2007 – 2008, 2010 – 2013	96	All Ages	M (41), F (59)	E1 (32), E2 (31), E3 (36)	1 and 5	All-cause
Samuel et al, 2013	USA	Olmsted County	1970 – 2004	369	All Ages	M (58), F (42)	E1 (29), E2 (37), 117 (32)	1, 3, 5, 10, 20, 30	UC-related
Verdon et al, 2020	Canada	RAMQ	1996 – 2015	14000	All Ages	M (50), F (50)	-	5	All-cause

M: Male, F: Female, E1: Proctitis, E2: Left-sided Colitis, E3: Extensive Colitis, UC: Ulcerative Colitis