Table 4.

Prior identification of IBS (diagnostic or therapeutic codes) for cases of Crohn’s disease and UC and their matched controls with at least 10 years of follow-up

	Prior diagnosis of IBS	Crohn’s disease			Controls			UC			Controls
		N = 1551	%	95% CIs	N = 15,072	%	95% CIs	N = 2327	%	95% CIs	N = 22,997	%	95% CIs
IBS from diagnostic or prescription codes only in those with >10 years follow-up.	Ever	622	40.1	37.7, 42.5	1914	12.7	12.2, 13.2	704	30.3	28.4, 32.1	3018	13.1	12.7,13.6
	Never	929	59.9	57.5, 62.3	13,158	87.3	86.8, 87.8	1623	69.7	67.9, 71.6	19,979	86.9	86.4,87.3
	0–3 months	93	6.0	4.8, 7.2	31	0.2	0.1, 0.3	93	4.0	3.2, 4.8	35	0.2	0.1, 0.2
	3–6 months	65	4.2	3.2, 5.2	31	0.2	0.1, 0.3	52	2.2	1.6, 2.8	60	0.3	0.2, 0.3
	6–9 months	27	1.7	1.1, 2.4	40	0.3	0.2, 0.3	27	1.2	0.7, 1.6	43	0.2	0.1, 0.2
	9–12 months	27	1.7	1.1, 2.4	37	0.2	0.2, 0.3	27	1.2	0.7, 1.6	46	0.2	0.1, 0.2
	1–2 years	66	4.3	3.3, 5.3	133	0.9	0.7, 1.0	53	2.3	1.7, 2.9	185	0.8	0.7, 0.9
	2–3 years	36	2.3	1.6, 3.1	121	0.8	0.7, 0.9	49	2.1	1.5, 2.7	205	0.9	0.8, 1.0
	3–4 years	28	1.8	1.1, 2.5	139	0.9	0.7, 1.0	49	2.1	1.5, 2.7	188	0.8	0.7, 0.9
	4–5 years	31	2.0	1.3, 2.7	130	0.9	0.7, 1.0	31	1.3	0.9, 1.8	203	0.9	0.8, 1.0
	5–6 years	31	2.0	1.3, 2.7	132	0.9	0.7, 1.0	31	1.3	0.9, 1.8	212	0.9	0.8, 1.0
	6–7 years	35	2.3	1.5, 3.0	125	0.8	0.7, 1.0	32	1.4	0.9, 1.8	190	0.8	0.7, 0.9
	7–8 years	26	1.7	1.0, 2.3	105	0.7	0.6, 0.8	32	1.4	0.9, 1.8	179	0.8	0.7, 0.9
	8–9 years	17	1.1	0.6, 1.6	125	0.8	0.7, 1.0	43	1.9	1.3, 2.4	217	0.9	0.8, 1.1
	9–10 years	25	1.6	1.0, 2.2	109	0.7	0.6, 0.9	28	1.2	0.8, 1.6	175	0.8	0.6, 0.9
	10+ years	115	7.4	6.1, 8.7	656	4.4	4.0, 4.7	157	6.8	5.8, 7.8	1080	4.7	4.4, 5.0

IBS: irritable bowel syndrome; UC: ulcerative colitis; CI: confidence interval.