Tehran University of Medical Sciences Iranian Journal of Psychiatry 1735-4587 9 2 2014 06 15 96 109 Afarin Rahimi-Movaghar Iranian National Center for Addiction Studies (INCAS), Iranian Institute for Reduction of High-Risk Behaviors, Tehran University of Medical Sciences, Tehran, Iran Masoumeh Amin-Esmaeili Department for Mental Health and Substance Use, Iranian Research Center for HIV/AIDS (IRCHA), Iranian Institute for Reduction of High-Risk Behaviors, Tehran University of Medical Sciences, Tehran, Iran Vandad Sharifi Psychiatry and Psychology Research Center and department of Psychiatry, Tehran University of Medical Sciences, Tehran, Iran Ahmad Hajebi Mental Health Research Centre, Tehran Psychiatric Institute, Iran University of Medical Sciences, Tehran, Iran Reza Radgoodarzi Iranian National Center for Addiction Studies (INCAS), Iranian Institute for Reduction of High-Risk Behaviors, Tehran University of Medical Sciences, Tehran, Iran Mitra Hefazi Iranian National Center for Addiction Studies (INCAS), Iranian Institute for Reduction of High-Risk Behaviors, Tehran University of Medical Sciences, Tehran, Iran Abbas Motevalian Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran 2015 10 14 Iranian Mental Health Survey (IranMHS) was conducted to assess the twelve-month prevalence and severity of psychiatric disorders in the Iranian adult population and to determine the pattern of health care utilization and cost of services. IranMHS is a cross-sectional national household survey with face-to-face interviews as the main data collection method. The study was carried out between January and June 2011. A three-stage probability sampling was applied for the selection of a representative sample from the non-institutionalized population aged 15 to 64. The primary instrument utilized for assessing the prevalence of mental disorders was the Persian version of Composite International Diagnosis Interview, version 2.1. The instruments for assessing the service and cost of mental illness were developed by the research team. The response rate was 86.2%, and a total of 7886 individuals participated in the study. Sampling weights were the joint product of inverse probability of unit selection, non-response weights and post-stratification weights. This paper presents an overview of the study design, fieldwork organization and procedures, weightings and analysis. The strengths and limitations of the study are also discussed. https://ijps.tums.ac.ir/index.php/ijps/article/view/108 https://ijps.tums.ac.ir/index.php/ijps/article/download/108/104