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Table 1 Information on the Impact of Events Scale-Revised (IES-R) and IES-6 items and scoring

From: The IES-R remains a core outcome measure for PTSD in critical illness survivorship research

InstrumentSourceAccess information
IES-RPublicationWeiss DS, Marmar CR. The impact of event scale – revised. In Assessing Psychological Trauma and PTSD. 1997, 399–411. (page 408, Chapter 13*)
Douglas Mental Health Institute and McGill University (page 6 of pdf*)
New York University Rory Meyers College of Nursing (page 2 of pdf*)
PublicationBeck JG, et al. The impact of event scale-revised: psychometric properties in a sample of motor vehicle survivors. Journal of Anxiety Disorders, 2008;22 (2) 187–198.
IES-6-itemPublicationHosey et al. Screening for posttraumatic stress disorder in ARDS survivors: validation of the Impact of Event Scale-6 (IES-6). Critical Care, 2019; 23 (1), 1–7.
  1. *Recommended approach for scoring IES-R based on existing IES-R psychometric publication in acute respiratory failure survivors (Bienvenu OJ, et al. Posttraumatic stress disorder in survivors of acute lung injury: evaluating the Impact of Event Scale-Revised. Chest, 2013; 144 (1), 24–31.) and Dr. Daniel S. Weiss (personal communication June 20, 2014):
  2.  • To obtain the three subscale scores (avoidance, hyperarousal, intrusion): calculate the mean of the subscale items
  3.  • To obtain a total score: calculate the mean of all non-missing items in the instrument
  4.  • IES-6-item is scored as mean value for these six items from IES-R