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The development of the Self-Rating Inventory for Posttraumatic Stress Disorder
J E Hovens1, H M van der Ploeg, I Bramsen
1Centre 45, National Center for the Treatment of WW II Victims, Oegstgeest, The Netherlands.
Acta Psychiatrica Scandinavica
|September 1, 1994
Summary
A new Self-rating Inventory for Posttraumatic Stress Disorder (PTSD) effectively diagnoses PTSD in surveys. This trauma-independent scale shows high reliability and differentiates PTSD from non-PTSD and traumatized patients.
Area of Science:
- Psychiatry
- Psychological Assessment
- Trauma Studies
Background:
- Posttraumatic Stress Disorder (PTSD) diagnosis requires reliable assessment tools.
- Existing instruments may have limitations in trauma independence or efficiency.
Purpose of the Study:
- To introduce and validate a new Self-rating Inventory for Posttraumatic Stress Disorder (PTSD).
- To assess the instrument's reliability, validity, and diagnostic capabilities.
Main Methods:
- Development of a 47-item, trauma-independent self-report scale.
- Validation on 76 war-traumatized subjects and 59 psychiatric outpatients.
- Psychometric analysis including test-retest reliability, internal consistency (Cronbach's alpha), and correlation with established PTSD measures.
Main Results:
- High test-retest reliability (0.90) and internal consistency (alpha=0.96 for the full scale, 0.92 for the DSM-III-R subscale).
- Significant correlations with established PTSD scales (Clinician Administered PTSD Scale, Mississippi Scale, MMPI PTSD subscale, Impact of Event Scale).
- Factor analysis identified four key PTSD symptom clusters: numbing, intrusion, avoidance, and sleeping problems.
Conclusions:
- The Self-rating Inventory for PTSD is a reliable and valid instrument for diagnosing PTSD in survey research.
- The scale demonstrates strong efficiency, surpassing some existing measures.
- It effectively differentiates between PTSD, non-PTSD traumatized individuals, and non-traumatized psychiatric patients.