Perinatal and early life risk factors for inflammatory bowel disease

Table 1 Age at first day case or inpatient admission for offspring with inflammatory bowel disease n (%)

	Age at first hospitalisation (yr) with inflammatory bowel disease						Total
	< 1	1-4	5-9	10-14	15-19	20-29
Crohn’s disease
Male	1 (2)	1 (2)	4 (7)	11 (20)	18 (33)	20 (36)	55 (100)
Female	0	0	0	11 (19)	19 (32)	29 (49)	59 (100)
Total	1 (1)	1 (1)	4 (4)	22 (19)	37 (32)	49 (43)	114 (100)
Ulcerative colitis
Male	0	1 (3)	2 (7)	2 (7)	7 (24)	17 (59)	29 (100)
Female	0	1 (3)	3 (8)	6 (16)	11 (30)	16 (43)	37 (100)
Total	0	2 (3)	5 (8)	8 (12)	18 (27)	33 (50)	66 (100)