Tehran University of Medical Sciences Journal of Biostatistics and Epidemiology 2383-4196 7 4 2021 12 15 360 370 Elham Eazari Department of Medical Informatics, Faculty of medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Somayr Nazari Ph.D Student of Neuroscience, School of Advanced Technologies in Medical Science, Mazandaran University of Medical Science, Mazandaran,Iran. Zahra Ebnehosseini Ph.D. of Medical Informatics, Psychiatry and Behavioral Sciences Research Center, Mashhad University of Medical Sciences, Mashhad, Iran. Reza Akhavan Department of Emergency Medicine, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. Hamed Tabesh Department of Medical Informatics, Faculty of medicine, Mashhad University of Medical Sciences, Mashhad, Iran 2021 04 05 2021 09 06 Introduction:Poisoning is one of the most common causes of hospital admission. This study aims at 1- to determine the characteristics of poisoning, 2-to discover the relationship of the patients’ characteristics, and 3- to suggest a pattern of characteristics of poisoning.  MethodS: In this descriptive cross-sectional study, characteristics’ of patients with poisoning were extracted from the hospital information system (HIS) in a large teaching hospital. Gender, type of admission, the priority of admission, type of referral, cause of referral, insurance organization, age, and month of referral were the variables extracted. Data were analyzed using descriptive and analytical statistical methods in SPSS software version 21. Results Of the 15204 patients included in this analysis, 55.2% of the patients were men. Also, 68.5% had non-urgent triage level, and the cause of the 60.7% of the poisoning was medication overdose. Most of the patients (86.2%) aged from 30 to 20 years with the most frequent referral in May, June, July, and August. According to logistic regression results, gender, type of admission, type of referral, cause of referral, insurance organization, age, and referral month has a statistically significant effect on triage level. Conclusion: The use of preventive measures from the occurrence of poisoning is necessary for the country because this problem occurs due to the lack of awareness about its causative factors. Regarding the more prevalence of intentional poisoning, the necessary steps are needed to be taken to identify the Psychological causes and prevent suicide in at-risk groups. https://jbe.tums.ac.ir/index.php/jbe/article/view/466