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P352. Rates of hospitalization for inflammatory bowel diseases in Poland

A. Jakubowski1, W. Bartnik2, E. Kraszewska2, J. Didkowska3, U. Wojciechowska3

1Department of Gastroenterology, Institute of Oncology, Warsaw, Poland; 2Department of Gastroenterology and Hepatology, Medical Center for Postgraduate Education, Warsaw, Poland; 3Department of Epidemiology and Cancer Prevention, Institute of Oncology, Warsaw, Poland

Aims and Methods: Chronic inflammatory bowel diseases (IBD) include ulcerative colitis (UC) and Crohn's disease (CD). There are no data regarding epidemiology of these diseases in Poland.

The aim of this study was to determine trends in the rates of hospital admissions for IBD in 1991–1996 and 2003–2007 and to assess the new hospitalized cases of these diseases in the period of 2004–2007. The data on hospital admissions were extracted from statistical cards collected by the National Institute of Public Health in Warsaw. The data included discharge diagnosis (according to the International Classification of Diseases) and age, gender, date of birth and postal code of the patient's residence. Every sixth hospital admission in the period of 1991–1996 and all hospital admissions in the period of 2003–2007 were included into the study. The trends in hospital admissions were analysed based on hospitalization indices estimated by age group, gender and region of residence. The new hospitalized cases also were identified to asses potential trends in incidence of IBD. The results were subjected to statistical analysis using the Poisson regression model.

Results: Between 2003–2007, there were 37706 and 13573 hospital discharge diagnoses of UC and CD, respectively. The relative decrease in the rate of hospitalizations for UC compared to that for CD was observed in this period (UC/CD rates were 3.4 and 2.3 in 2003 and 2007, respectively). The statistical analysis of the hospitalization indices demonstrated the significant increasing trend for both diseases in groups under 40 years of age in each studied year (p < 0.001). This trend was most evident in the youngest age groups (0–16 and 17–29 years of age). The numbers of hospital admissions due to both diseases were greater in highly industrialized regions (Lower Silesia and Upper Silesia) compared with those in rural areas. The increasing trend of new hospitalized cases of CD in the period of 2004–2007 was found, mainly in the youngest age groups (p = 0.02). Numbers of new UC patients in the studied period were significantly decreasing (p < 0.001), particularly in the older age groups.

Conclusions: Increasing trend in hospital admissions for IBD may demonstrate the greater incidence of these diseases, which can be attributed, at least partly, to the influence of environmental factors.