Patients with inflammatory bowel disease have increased risk of autoimmune and inflammatory diseases

Table 1 Participants’ demographic data

Variables	IBD	Control	UC	Control	CD	Control	Both1	Control
n	47325	92839	31066	60951	13343	26172	2916	5716
Female	54%	55%	53%	53%	58%	58%	56%	56%
Male	46%	45%	47%	47%	42%	42%	44%	44%
Mean age at entry, yr	53	53	55	55	49	49	47	47
Mean age at onset of IBD, yr	42	-	44	-	37	-	34	-
Mean duration of IBD at entry, yr	10	-	9	-	10	-	11	-
Comorbidity 02	77%	83%	76.50%	82.00%	77%	85%	82%	87%
Comorbidity 1-2	18%	13.50%	18.00%	14%	18%	12%	15%	10%
Comorbidity ≥ 3	5%	3.50%	5.50%	4%	5%	3%	3%	3%

¹Patients registered with both CD and UC;

²No. of comorbidities at onset of IBD according to the Charlson comorbidity index. CD: Crohn’s disease; UC: Ulcerative colitis; IBD: Inflammatory bowel disease.