Incidence of type 1 diabetes mellitus

in 15–29 age group in Warmia and Mazury Region between 1994–2003 Background. The incidence rate of type 1 diabetes (T1DM) has increased worldwide. Most studies have been performed in the 0–14 year age-group and only a few registries include the group over 15 years of age. The aim of the study was to assess the incidence of T1DM in the age group 15–29. Materials and methods. Between 1994–2003 all newly diagnosed cases of T1DM in the age group 15–29 years in Olsztyn Region were recorded prospectively. General data on the population were taken from the Demographic Year-book of Poland. Incidence in the group aged 15–29 years by age, sex, were calculated per 100,000 population. Results. A total number of new cases registered 1994– –2003 was 148. The incidence rate per year was 7.7 in age group 15–29 years. There was no sex differences. The high-est incidence was recorded in women aged 25–29 — 7.8 and men aged 15–19 — 9.3. Comparing 5-years periods there were no significant changes in the incidence. During the 10-year observation period the incidence did not in-crease. The annual increase in incidence was 0.7%. Conclusions. 1. The incidence rate per year was 7.7/100 000 in 15–29 age-group in Olsztyn Region. 2. In years 1994– –2003 the incidence of T1DM was not growing. 3. The an-nual increase in incidence was 0.7%. key words: type 1 diabetes, epidemiology, incidence Address for correspondence