The development of the Self‐Rating Inventory for Posttraumatic Stress Disorder

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Abstract
In this study a newly developed Self‐rating Inventory for Posttraumatic Stress Disorder (PTSD) is presented. The instrument consists of 47 items, reflecting DSM‐III‐R criteria, associated features and items corresponding to the disorder of extreme stress not otherwise specified. All items are phrased in a trauma‐independent way and are measured on an intensity scale. The instrument was validated on 76 subjects with war‐related trauma and 59 psychiatric outpatients, one third of whom were traumatized. Test‐retest for the scale was 0.90. The coefficient alpha appeared to be 0.96 for the 47‐items scale and 0.92 for the 22 DSM‐III‐R subscale. The scale correlated significantly with the Clinician Administered PTSD Scale, the Mississippi Scale for Combat‐related PTSD, the MMPI PTSD subscale and the Impact of Event Scale. The overall efficiency of the Self‐rating Inventory for PTSD was comparable to the overall efficiency of the Mississippi Scale and superior to the MMPI PTSD subscale. Factor analysis on the 22 DSM‐III‐R items showed 4 factors, representing numbing, intrusion, avoidance and sleeping problems. It is concluded that the Self‐rating Inventory for PTSD is a powerful instrument for diagnosing PTSD in survey research. The instrument appears to be capable of differentiating not only between PTSD and non‐PTSD subjects but also between traumatized non‐PTSD subjects and non‐traumatized psychiatric patients.

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