en تخصصي Special پژوهشي Research <span style="font-size:11pt"><span style="text-justify:inter-ideograph"><span style="line-height:normal"><span calibri="" style="font-family:"><b><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Objective:</span></span></span></b><b> </b><span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">Type 1 diabetes mellitus (T1DM) 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 (2019-2020) incidence of T1DM in Hamadan west region of Iran.</span></span><i><span dir="RTL" lang="FA" style="font-size:10.5pt"><span style="font-family:"Times New Roman","serif""></span></span></i></span></span></span></span><br> <span style="font-size:11pt"><span style="text-justify:inter-ideograph"><span style="line-height:normal"><span calibri="" style="font-family:"><b><span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">Materials and Methods</span></span></b><b><span dir="RTL" lang="FA" style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">:</span></span></b> <span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">All 25 new patients with T1DM resident of Hamadan and its suburbs registered in Besat Hospital, Hamadan, Iran, from March 2019 to 2020 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.</span></span><i><span dir="RTL" style="font-size:10.5pt"><span style="font-family:"Times New Roman","serif""></span></span></i></span></span></span></span><br> <span style="font-size:11pt"><span style="text-justify:inter-ideograph"><span style="line-height:normal"><span calibri="" style="font-family:"><b><span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">Results</span></span></b><b><span dir="RTL" lang="FA" style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">:</span></span></b> <span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">During 1 year survey, a total of 57 cases of newly diagnosed T1DM were identified in our center. Among these, 25 patients were residents of Hamadan city and suburbs. Based on this15 per 100 000 per year new cases T1DM occurred in the resident population of Hamadan areas, higher in boys than in girls (18 vs. 11 per 100 000).The mean age of diagnosis was 8.03 yr. The peak incidence was observed at the age group of 10-14 years. 92% were urban .Most cases were diagnosed in the autumn (44%). 52% had a history of neonatal jaundice and 16% had stressful life events in the family before the onset of diabetes.</span></span><b><i><span dir="RTL" lang="FA" style="font-size:10.5pt"><span style="font-family:"Times New Roman","serif""></span></span></i></b></span></span></span></span><br> <span style="font-size:11pt"><span style="text-justify:inter-ideograph"><span style="line-height:normal"><span calibri="" style="font-family:"><b><span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">Conclusion</span></span></b><b><span dir="RTL" lang="FA" style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">:</span></span></b> <span style="font-size:10.5pt"><span new="" roman="" style="font-family:" times="">Our study showed a relatively high incidence of T1DM according category of the WHO, being greater in boys and in the age group of 10 to 14 years. The incidence is lower than in some Middle Eastern countries.</span></span><i><span dir="RTL" lang="FA" style="font-size:10.5pt"><span style="font-family:"Times New Roman","serif""></span></span></i></span></span></span></span><br> &nbsp; Characteristics, Incidence, Diabetes mellitus, Type 1 149 157 http://ijdo.ssu.ac.ir/browse.php?a_code=A-10-30-384&slc_lang=en&sid=1 Zahra Razavi 0000-0001-5318-9087 Yes Professor, Department of Pediatrics, Hamadan University of Medical Sciences, Hamadan, Iran. Pegah Ammeri 0000-0003-0351-8000 No M.Sc. Epidemiology Department of Epidemiology, School of Public Health Hamadan University of Medical Sciences, Hamadan, Iran.