Interactive Interpreter

IES-R: Impact of Event Scale-Revised

The IES-R (Impact of Event Scale-Revised) is a 22-item self-report questionnaire that measures subjective distress about a specific traumatic event over the past seven days, with Intrusion, Avoidance, and Hyperarousal subscales. Score 0–88; ≥33 suggests probable PTSD.

For professional reference, research, and education only. Not for diagnosis or medical advice.

IES-R Score Interpreter

  • IES-R Score Calculator

    Enter each of the 22 items (0–4) to total them and see the band. Items are numbered, not reproduced — enter them from the form in front of you. Scoring aid only; it does not diagnose.

    0 of 22 items entered — 22 still blank. The total can only rise, so treat the range as provisional.

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    Each item scores 0–4.

  • Enter a total score to see its range.

  • 22 items across Intrusion, Avoidance, and Hyperarousal subscales. Each rated 0–4; sum across all items. Interpreted in reference to a specific traumatic event over the past 7 days.

    Total scoreInterpretation
    37+Severe distressCommonly used clinical convention indicating severe post-traumatic stress response. Warrants urgent clinical assessment.
    33–36Probable PTSD likely≥33 was identified as the optimal screening cutoff by Creamer, Bell & Failla (2003). Structured clinical evaluation recommended.
    24–32Moderate/partial PTSD possibleCommonly used clinical convention indicating clinically meaningful symptoms that fall below the full screening threshold. Follow-up assessment warranted.
    0–23Below screening thresholdScore below the moderate symptoms convention threshold. Ongoing monitoring may still be appropriate following trauma exposure.

    Creamer, Bell & Failla (2003). ≥33 cutoff established in that validation study. The ≥24 and ≥37 thresholds reflect commonly used clinical convention and are not formally established in a single primary source.

The IES-R (Impact of Event Scale-Revised) is a 22-item self-report measure of subjective distress related to a specific traumatic event [1]. It covers three PTSD symptom clusters, Intrusion, Avoidance and Hyperarousal, with totals from 0 to 88.

Check the copyright holder's terms before clinical or commercial use.

What does the IES-R measure?

The IES-R was developed by Daniel Weiss and Charles Marmar [1] as an update to the original Impact of Event Scale, a 1979 scale of event-related intrusion and avoidance [4]. The revision added a Hyperarousal subscale to bring the scale into alignment with the DSM-IV PTSD diagnostic criteria. It assesses subjective distress related to a specific traumatic event, making it distinct from general PTSD measures.

The IES-R contains 22 items across three subscales: Intrusion (8 items, intrusive thoughts, images, nightmares), Avoidance (8 items, numbing, avoidance of reminders), and Hyperarousal (6 items, irritability, poor concentration, startle response).

For DSM-5-TR-aligned PTSD assessment, the PCL-5 is recommended as the primary clinical tool.

How do you give the IES-R?

The IES-R is a self-report questionnaire completed by the individual, not a structured clinician interview. Respondents identify a specific traumatic event and rate how distressing each of the 22 difficulties has been during the past seven days, on a 5-point scale: 0 (Not at all), 1 (A little bit), 2 (Moderately), 3 (Quite a bit), 4 (Extremely).

Educational reference only. Requires clinical evaluation to confirm PTSD diagnosis.

How do you score and interpret the IES-R?

Total scores are the sum of all 22 items (range 0–88). Scores can also be reported by subscale: Intrusion (8 items), Avoidance (8 items), and Hyperarousal (6 items).

A total score of ≥33 suggests probable PTSD: in the veteran validation study, a mean item cutoff of 1.5 (equivalent to a total score of 33) gave the best diagnostic accuracy [2]. The ≥24 and ≥37 thresholds in the scorer are commonly used conventions rather than cutoffs from a single validation study. A high score is a screening indicator, not a diagnosis.

Psychometric properties

  • Internal consistency. In two samples of male Vietnam veterans (120 treatment-seeking with confirmed PTSD; 154 community), the IES-R showed high internal consistency (alpha = 0.96) [2].
  • Convergent validity. The correlation between the IES-R and the PTSD Checklist was high (0.84) [2].
  • Factor structure. Confirmatory factor analysis in the veteran samples did not support the three-subscale structure, favouring a single or two-factor solution [2]; in 182 motor vehicle accident survivors, the three-factor structure was supported with adequate subscale internal consistency, concurrent and discriminative validity, and no social desirability effects [3].

Limitations

  • Screening, not diagnosis. The IES-R cannot establish a PTSD diagnosis; a high score warrants a structured diagnostic evaluation.
  • DSM-IV alignment. It was revised to align with DSM-IV PTSD criteria; for DSM-5-TR-aligned PTSD assessment, the PCL-5 is recommended.
  • Subscale structure. Evidence for the three subscales is mixed across samples, so the total score is the more robust index [2] [3].
  • Cutoff population. The ≥33 cutoff was derived in male Vietnam veterans and may perform differently in other groups.
  • Self-report. Scores depend on the respondent's recall of the past seven days and willingness to report symptoms.

For individuals: This page is a clinical reference, not a diagnostic tool. If you have concerns about your own symptoms, bring this information to a qualified mental health professional.

Related

FAQ

  • Is the IES-R self-report or clinician-administered?

    The IES-R is a self-report questionnaire completed by the individual. It is not a structured clinician interview. Respondents rate 22 items on a 0–4 scale in reference to a specific traumatic event from the past seven days.

  • What does a score of 33 or higher mean on the IES-R?

    A total IES-R score of ≥33 suggests probable PTSD. In a 2003 validation study in male Vietnam veterans, this threshold (equivalent to a mean item rating of 1.5) gave the best diagnostic accuracy. It is a screening indicator, not a diagnosis.

  • Can the IES-R diagnose PTSD?

    No. The IES-R is a symptom screener, not a diagnostic tool. A high score supports clinical concern and warrants a structured diagnostic evaluation by a qualified clinician. Only a thorough clinical assessment can establish a PTSD diagnosis.

  • How is the IES-R scored?

    Each of the 22 items is rated 0 (Not at all), 1 (A little bit), 2 (Moderately), 3 (Quite a bit), or 4 (Extremely). Total scores range from 0 to 88. Scores can also be reported by subscale: Intrusion (8 items), Avoidance (8 items), and Hyperarousal (6 items).

References

    1. 1.Weiss DS, Marmar CR. The Impact of Event Scale-Revised. In: Wilson JP, Keane TM, eds. Assessing Psychological Trauma and PTSD. Guilford Press. 1997:399-411.
    2. 2.Creamer M, Bell R, Failla S. Psychometric properties of the Impact of Event Scale-Revised. Behav Res Ther. 2003;41(12):1489-96.
    3. 3.Beck JG, Grant DM, Read JP, Clapp JD, Coffey SF, Miller LM, Palyo SA. The impact of event scale-revised: psychometric properties in a sample of motor vehicle accident survivors. J Anxiety Disord. 2008;22(2):187-98.
    4. 4.Horowitz M, Wilner N, Alvarez W. Impact of Event Scale: a measure of subjective stress. Psychosom Med. 1979;41(3):209-18.

HiBoop does not offer this scale. This page is reference material.This library is an academic and clinical reference. A scale described here is not necessarily offered in HiBoop; each page says whether it is.

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