Table 1 Demographic characteristics of Olmsted County, Minnesota, residents diagnosed with inflammatory bowel disease during 1940–2001.

Calendar period at diagnosis	Crohn's disease				Ulcerative colitis
	All patients	Women	Men	Median age at diagnosis (y)	All patients	Women	Men	Median age at diagnosis (y)
1940–1949	9	3	6	42.8	12	7	5	47.1
1950–1959	12	8	4	38.6	22	13	9	35.5
1960–1969	44	23	21	28.1	61	25	36	31.2
1970–1979	72	44	28	26.0	82	39	43	30.9
1980–1989	72	32	40	27.8	85	31	54	32.5
1990–2001	105	49	56	34.0	116	51	65	35.2
All years	314	159	155	28.9	378	166	212	33.3