[High incidence rates of inflammatory bowel disease in Navarra (Spain). Results of a prospective, population-based study].

Introduction: As reflected in the European Collaborative Study on Inflammatory Bowel Disease (1991-1993), differences between northern and southern European countries in the incidence of ulcerative colitis (UC) and Crohn's disease (CD) show a tendency to decrease. No data are available on the current incidence of these diseases in Navarre (northern Spain).

Aim: To determine the present incidence of inflammatory bowel disease (IBD) in Navarra.