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Results of the retrospective, population-based study, 2000–2010, on inflammatory bowel disease, ulceratice colitis (UC) and Crohn's disease (CD), from Zadar County, have been presented and compared with world experience and com- parative data from Primorsko-Goranska and Vukovarsko-Srijemska Counties. The average incidence rates (per 100 000) were 8.2 and 8.4, for UC and CD, respectively. Prevalence rates, at the end of the follow up, were 133.9 for UC and 111 for CD. Constant increase in the incidence rates for both, UC and CD, have been recorded, for CD more prominently in the second part of the follow up, 2006–2010. Prevalence rates have being continuosly rased for both diseases, data for UC ex- ceeding that for CD. Results of data comparison among the counties contribute in favour to the hypothesis of Zadar County as a rapidly developing area and strongly argue against the existence of the North-South gradient between Vukovarsko-Srijemska and Zadar Counties.

Inflammatory bowel diseases (IBD), Crohn's disease (CD) and ulcerative colitis (UC), were retrospectively assessed on the incidence and prevalence in Vukovarsko-Srijemska County, continental Croatia. There were a total number of 150 patients, 119 with UC and 31 with CD. Of them, 79.3% were patients with UC, indicating a predominant participation of UC in the sample. Comparisons between the period of surveillance, 2001-2010, and the decade before, 1991-2000, showed a significant increase in the incidence rates of both, UC and CD (UC 3.5, CD 0.95, 2001-2010, and UC 1.0, CD 0.45, 1991-2000). Comparison of this study with that performed in Primorsko-Goranska County, coastal Croatia, revealed different distribution patterns of IBD. In Primorsko-Goranska County, significantly higher incidence and prevalence rates of UC and CD and rather equal ratios between two diseases, were observed. The results are indicative of the differences between more developed Western and less developed Eastern parts of Croatia.