Zahra Razavi - Professor, Department of Pediatrics, Hamadan University of Medical Sciences, Hamadan, Iran.
Pegah Ammeri - M.Sc. Epidemiology Department of Epidemiology, School of Public Health Hamadan University of Medical Sciences, Hamadan, Iran.

Objective: Type ۱ diabetes mellitus (T۱DM) results from the autoimmune destruction of insulin-producing beta cells of the pancreas. The objective of the present study was to describe the one year (۲۰۱۹-۲۰۲۰) incidence of T۱DM in Hamadan west region of Iran. Materials and Methods: All ۲۵ new patients with T۱DM resident of Hamadan and its suburbs registered in Besat Hospital, Hamadan, Iran, from March ۲۰۱۹ to ۲۰۲۰ were prospectively reviewed. Information including age, sex, place of residence (urban or rural), season of diagnosis and season of birth were taken from parents through face-to-face interviews. Results: During ۱ year survey, a total of ۵۷ cases of newly diagnosed T۱DM were identified in our center. Among these, ۲۵ patients were residents of Hamadan city and suburbs. Based on this۱۵ per ۱۰۰ ۰۰۰ per year new cases T۱DM occurred in the resident population of Hamadan areas, higher in boys than in girls (۱۸ vs. ۱۱ per ۱۰۰ ۰۰۰).The mean age of diagnosis was ۸.۰۳ yr. The peak incidence was observed at the age group of ۱۰-۱۴ years. ۹۲% were urban .Most cases were diagnosed in the autumn (۴۴%). ۵۲% had a history of neonatal jaundice and ۱۶% had stressful life events in the family before the onset of diabetes. Conclusion: Our study showed a relatively high incidence of T۱DM according category of the WHO, being greater in boys and in the age group of ۱۰ to ۱۴ years. The incidence is lower than in some Middle Eastern countries.

Characteristics, Incidence, Diabetes mellitus, Type ۱