Description

The Impact of Event Scale – Revised (IES-R) is a revised version of the original Impact of Event Scale (IES), designed to assess the severity of symptoms experienced after a traumatic event. It is widely used in both clinical practice and research to evaluate symptoms associated with post-traumatic stress.

Analysis

The IES-R assesses three main dimensions. Intrusion refers to recurrent and unwanted thoughts, images, memories, flashbacks, or nightmares related to the traumatic event.

Avoidance measures the tendency to avoid thoughts, emotions, conversations, activities, or situations associated with the traumatic experience.

Hyperarousal assesses symptoms such as irritability, heightened distress, increased sensitivity to stimuli, and difficulty concentrating or calming down.

The scale includes 22 items, which are answered using a Likert-type response format to reflect the intensity of symptoms.

Purpose

The primary purpose of the IES-R is to assess the presence and severity of post-traumatic stress symptoms following a specific traumatic event. It can also be used to monitor changes in symptom severity over time and to evaluate progress during treatment or other supportive interventions.

Scoring

The total score is calculated by summing the individual item scores, with higher scores indicating greater symptom severity.

Scores may also be examined separately for the three main dimensions—Intrusion, Avoidance, and Hyperarousal—to provide a more detailed understanding of the different aspects of the psychological impact of the traumatic event.

References

Creamer, M., Bell, R., & Failla, S. (2003). Post-traumatic stress disorder: The Impact of Event Scale-Revised. Australian & New Zealand Journal of Psychiatry, 37(5), 554–562.

Horowitz, M. J., Wilner, N., & Alvarez, W. (1979). Impact of Event Scale: A measure of subjective stress. Psychosomatic Medicine, 41(3), 209–218.

Weiss, D. S., & Marmar, C. R. (1997). The Impact of Event Scale – Revised. In Assessing Psychological Trauma and PTSD. Guilford Press.