AUTHOR=Sharif Nia Hamid , Kaur Harpaljit , Fomani Fatemeh Khoshnavay , Rahmatpour Pardis , Kaveh Omolhoda , Pahlevan Sharif Saeed , Venugopal A. Vijayalakshmi , Hosseini Lida 

TITLE=Psychometric Properties of the Impact of Events Scale-Revised (IES-R) Among General Iranian Population During the COVID-19 Pandemic

JOURNAL=Frontiers in Psychiatry

VOLUME=Volume 12 - 2021

YEAR=2021

URL=https://www.frontiersin.org/journals/psychiatry/articles/10.3389/fpsyt.2021.692498

DOI=10.3389/fpsyt.2021.692498

ISSN=1664-0640

ABSTRACT=Objective: The aim of this study was to translate and evaluate the validity and reliability of the Impact of Events Scale-Revised (IES-R) among the Iranian general population during the COVID-19 pandemic. 
Method: This study was methodological cross-sectional. It was conducted on an Iranian public population from April to July 2020 which was during the COVID-19 pandemic. Construct validity was determined through Exploratory Factor Analysis (EFA) and Confirmatory Factor Analysis (CFA) with a total of 500 adults,  recruited via online data gathering. Reliability was checked through the Average Inter-Item Correlation (AIC), Cronbach’s alpha, and McDonald’s omega. Convergent and divergent validity was determined using Fornell and Larcker’s approach. 
Results: The results showed that the Persian version of IES-R had three factors, including intrusion (6 items), avoidance (7 items), and hyperarousal (5 items), which explained 59.22% of the total variance of the IES-R. The CFA findings indicated that all goodness of fit indices confirmed the model fit. The Cronbach’s alpha, McDonald’s omega, Composite Reliability (CR), and maximal reliability were excellent and the three factors have good convergent validity. 
Conclusion: The findings of this study indicated that the Persian version of the IES-R scale is efficient and useful to assess Post-Traumatic Stress Disorder among Iran general population in the COVID-19 outbreak.