The Impact of Event Scale-Revised (IES-R) was developed by Daniel Weiss and Charles Marmar (1997) from the original scale by Horowitz, Wilner and Alvarez. Its 22 statements describe reactions to one stressful event: unwanted thoughts and dreams, avoidance and numbness, and feeling on edge. Each answer scores 0 to 4 points, for a total from 0 to 88.
This is not a diagnosis
The scale shows how much one event still bothers you. In general it is not used to diagnose PTSD. The cutoff of 33 comes from research on veterans, so treat it as a prompt to talk to a professional.
What happens to your answers
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Source: Impact of Event Scale-Revised (IES-R): Weiss D. S., Marmar C. R., 1997, The Impact of Event Scale-Revised, in Wilson J. P., Keane T. M. (eds), Assessing Psychological Trauma and PTSD: A Practitioner's Handbook, Guilford Press, 399-411. Cutoff of 33: Creamer M., Bell R., Failla S., 2003, Psychometric properties of the Impact of Event Scale-Revised, Behaviour Research and Therapy 41(12), 1489-1496, DOI 10.1016/j.brat.2003.07.010.
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