Breastfeeding and genetic factors in the etiology of inflammatory bowel disease in children

Table 3 Incidence of ulcerative colitis

Annual incidence per 100000	Time period	Geographic region	Data collection	Age group studied	References
12.92 (white males)	1977-1979	Baltimore SMSA	Retrospective	All	[10]
11.79 (white females)					[10]
11.29 (non-white males)					[10]
12.90 (non-white females)					[10]
1.91	1968	Scotland	Retrospective	Children ≤ 16 years old	[72]
31.56	1983				[72]
0.06	1920-1929	Rochester, NY	Retrospective	All	[73]
3.51	1970-1979				[73]
2.32	1980-1989				[73]
6.9	1962-1969	Copenhagen	Prospective	All	[84]
9.2	1980-1987				[84]
0.71	1983-1993	South Glamorgan, Wales	Retrospective	Children < 16 years old	[75]
14.3	1989-1994	Manitoba, Canada	Retrospective	All	[77]
16.5	1990-1994	Iceland	Prospective	All	[79]
1.4	1984-1986	Sweden	Prospective	Children < 16 years old	[80]
3.2a	1993-1995				[80]
24.2	1988-1990	Northern France	Prospective	All	[81]
24.3	1991-1993				[81]
23.9	1994-1996				[81]
23.5	1997-1999				[81]
2.14	1990-1994	Southeastern Norway	Prospective	Children < 16 years old	[77]
2.14	2000-2001	Wisconsin	Prospective	Children < 18 years old	[83]

¹Age-adjusted; ²Age- and gender-adjusted; ³P = 0.052 compared to 1968; ^aP < 0.05 compared to 1984-1986.