Table 3.

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

	Prior diagnosis of IBS	Cases N = 4380	%	95% CIs	Controls N = 43,334	%	95% CIs
IBS from diagnostic or prescription codes only in those with >10 years follow-up.	Ever	1530	34.9	33.5, 36.3	5653	13.0	12.7, 13.4
	Never	2850	65.1	63.7, 66.5	37681	87.0	86.6, 87.3
	0–3 months	214	4.9	4.2, 5.5	79	0.2	0.1, 0.2
	3–6 months	124	2.8	2.3, 3.3	103	0.2	0.2, 0.3
	6–9 months	61	1.4	1.0, 1.7	93	0.2	0.2, 0.3
	9–12 months	60	1.4	1.0, 1.7	93	0.2	0.2, 0.3
	1–2 years	137	3.1	2.6, 3.6	368	0.8	0.8, 0.9
	2–3 years	97	2.2	1.8, 2.6	374	0.9	0.8, 1.0
	3–4 years	90	2.0	1.6, 2.5	374	0.9	0.8, 1.0
	4–5 years	76	1.7	1.3, 2.1	384	0.9	0.8, 1.0
	5–6 years	73	1.7	1.3, 2.1	378	0.9	0.8, 1.0
	6–7 years	75	1.7	1.3, 2.1	363	0.8	0.8, 0.9
	7–8 years	69	1.6	1.2, 1.9	321	0.7	0.7, 0.8
	8–9 years	70	1.6	1.2, 2.0	392	0.9	0.8, 1.0
	9–10 years	61	1.4	1.0, 1.7	326	0.7	0.7, 0.8
	10+ years	323	7.4	6.6, 8.1	2005	4.6	4.4, 4.8

IBS: irritable bowel syndrome; CI: confidence interval.