BACKGROUND: Reported epidemiology and phenotype distributions vary widely and disease burden of inflammatory bowel disease (IBD) is poorly described. Our aim was to establish these features in a population-based cohort covering 319 976 inhabitants. Furthermore, differences between tertiary referral and peripheral hospital patients were quantified. METHODS: IBD patients in the adherence area of three peripheral hospitals (2004-2012) were included. Medical and surgical treatment data were obtained. Quality of life and disease activity were evaluated. An outpatient cohort from a tertiary referral centre was accrued. RESULTS: A total of 1461 patients were included: 761 (52.1%) with ulcerative colitis (UC), 579 (39.5%) with Crohn's disease (CD) and 121 (8.3%) with IBD-unspecified. Point prevalence of IBD was 432.1 per 100 000 inhabitants in 2010, which increased significantly over time, P-value of less than 0.0001. The mean annual incidence was 17.2 for UC, 10.5 for CD and 2.2 for IBD-unspecified. Tertiary referral Crohn's patients used thiopurines and biological therapy and underwent surgery significantly more often than patients in peripheral hospitals (P<0.0001). Disease activity correlated negatively with quality of life (P<0.0001) in UC and CD. CONCLUSION: The prevalence of IBD is still increasing. Burden of disease was significantly more severe, mainly in Crohn's patients, in the referral centre, highlighting the importance of population-based studies to accurately describe phenotype distribution and disease burden.
BACKGROUND: Reported epidemiology and phenotype distributions vary widely and disease burden of inflammatory bowel disease (IBD) is poorly described. Our aim was to establish these features in a population-based cohort covering 319 976 inhabitants. Furthermore, differences between tertiary referral and peripheral hospital patients were quantified. METHODS: IBD patients in the adherence area of three peripheral hospitals (2004-2012) were included. Medical and surgical treatment data were obtained. Quality of life and disease activity were evaluated. An outpatient cohort from a tertiary referral centre was accrued. RESULTS: A total of 1461 patients were included: 761 (52.1%) with ulcerative colitis (UC), 579 (39.5%) with Crohn's disease (CD) and 121 (8.3%) with IBD-unspecified. Point prevalence of IBD was 432.1 per 100 000 inhabitants in 2010, which increased significantly over time, P-value of less than 0.0001. The mean annual incidence was 17.2 for UC, 10.5 for CD and 2.2 for IBD-unspecified. Tertiary referral Crohn's patients used thiopurines and biological therapy and underwent surgery significantly more often than patients in peripheral hospitals (P<0.0001). Disease activity correlated negatively with quality of life (P<0.0001) in UC and CD. CONCLUSION: The prevalence of IBD is still increasing. Burden of disease was significantly more severe, mainly in Crohn's patients, in the referral centre, highlighting the importance of population-based studies to accurately describe phenotype distribution and disease burden.
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