Trauma Mon. In Press(In Press):e61871. Published online 2017 October 3. doi: 10.5812/traumamon.61871. Research Article Epidemiology of Accidents in Tehran Emergency Medical Service During Years 2012 to 2013 Vahid Delshad, 1 Samaneh Sabzalizadeh, 2 Mohammad Javad Moradian, 3 Hamid Safarpour, 4,* Leila Malekyan, 5 Hashem Shemshadi, 6 and Ramin Beiranvand 7 1 Health in Emergency and Disaster Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran 2 Nursing Accreditation Office, Rofeyde Hospital, University of Social Welfare and Rehabilitation Sciences,Tehran, Iran 3 Trauma Research Center, Shahid Rajaee (Emtiaz) Trauma Hospital, Shiraz University of Medical Sciences, Shiraz, Iran 4 Department of Health in Disasters and Emergencies, School of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran 5 Department of Nursing, School of Nursing and Midwifery, Bam University of Medical Sciences, Bam, Iran 6 Department of Clinical Sciences Plastic & Reconstructive Surgery, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran 7 Health and Nutrition Research Center, Lorestan University of Medical Sciences, Khoramabad, Iran * Corresponding author: Hamid Safarpour, BSc, MSc in Nursing, PhD Student in Health in Disasters and Emergencies, Department of Health in Disasters and Emergencies, School of Health, Safety and Environment, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Tel: +98-9183463050, E-mail: h.safarpour@sbmu.ac.ir Received 2016 September 06; Revised 2017 March 16; Accepted 2017 May 24. Abstract Background: There is a lack of epidemiological data on emergency Medical service (EMS) missions for accidents in Iran. The present study aimed at obtaining representative data on the epidemiology of emergency Medical service missions for of accidents in Tehran, during years 2012 to 2013. Methods: Active EMS stations in Tehran were selected through stratified random sampling in different regions of the city during a twelve-month period from March 2012 to March 2013. Data was collected through a questionnaire on demographic information, which extracted from events recorded on dispatch electronic forms in EMS. Data was analyzed by Excel using descriptive statistics. Results: Based on the type of accidents, Road Traffic Accidents (RTA) and downfall in the North, stab wound in the East, burning in the West, and poisoning with CO in the East region of Tehran megacity had the highest rates compared to other areas. The most common of all were Road Traffic Accidents (RTA) (77.9%) stab wound (11.1%), falling down (4.6%), burns (2.1%), and Carbon Monoxide (CO) poisoning (1.5%). Most accidents occurred in males and 20- to 40-year-old age group (45.51%), and the western district had the first rank in Tehran. Conclusions: According to demographic and geographical rate of accidents, It is recommended to develop preparedness programs and response plan according to epidemiological information of accidents. This programs includes EMS staff trainings and commu- nity educations. Keywords: Emergency Medical Services (EMS), Accidents, Reports, Tehran, Road Traffic Accidents (RTA) 1. Background Accident is one the most important problems of pub- lic and social health around the world that leads to 12% of world’s illnesses and is the third main reason of death around the world. According to the reports of the world health organization (WHO), nearly 1.2 million people lose their life in traffic accidents every year and more than 50 million people are injured, which is equal to the popula- tion of five large cities (1). Accidents do not only belong to developing countries, and also occur in developed coun- tries, especially with the arrival of industry and technol- ogy in human life, and the development of communica- tion and urbanization, thus accidents are a major threat for human resources in different societies. In fact, this con- dition is what human beings have to lose for the develop- ment of technology (1). The increasing numbers of differ- ent kinds of accidents with several victims are undesirable consequences of urbanization (2). Pre-hospital emergency as a subset of medical emergency and events management center is the intersection of the hospital and society and is one of the institutes that people require in events (3). Accidents include unplanned events that can cause in- jury every day. Around the world, almost 16,000 people die from various injuries every day. Road traffic injuries are a major cause of mortality and account for more than 22% of all deaths related to injuries and will be the third leading cause of worldwide death until 2020. Iran is a country with a high rate of road traffic crash fatality and injury. According to statistics from the foren- sic Medicine organization of Iran, traffic crashes resulted in an annual average of 24,000 deaths (i.e. 3 people per hour) and approximately 240,000 injuries. Trauma is one of the most important factors that lead to death and dis- Copyright © 2017, Trauma Monthly. 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