Posttraumatic Stress Diagnostic Scale (PDS)
The Posttraumatic Stress Diagnostic Scale, or PDS, allows for posttraumatic stress disorders to be detected and diagnosed. The scale is primarily used by psychologists and counselors to investigate presence of PTSD in large groups and patients whom have experience a traumatic event, or to determine the significance of PTSD already present.
This test takes approximately 10 to 15 in order to administer and consists of 49 items. There are four subscales present – PTSD diagnosis, Symptom Severity Score, Symptom Severity Rating, and the Level of Impairment of Functioning.
Validity and Reliability
This instrument has strong validity due to its items directly reflecting the post traumatic experience in PTSD. According to Oxford University Journals, the alpha rating for the test is 0.92. Test-retest reliability was calculated to be -.74 representing a two to three week diagnosis of PTSD. A closely related instrument, the Structured Clinical Interview for DSM, yielded a high correlation with 0,83 rating.
Where to Purchase
Administration, Analysis and Reporting
Statistics Solutions consists of a team of professional methodologists and statisticians that can assist the student or professional researcher in administering the survey instrument, collecting the data, conducting the analyses and explaining the results.
For additional information on these services, click here.
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Foa, E. B., Cashman, L., Jaycox, L., & Perry K. (1995). The validation of self-report measure of post-traumatic stress disorder: The Post-traumatic Diagnostic Scale. Psychological Assessment, 9, 445-451.
Foa, E.B., & Rothbaum, B.O. (1998). Treating the trauma of rape: Cognitive-behavioral therapy for PTSD. New York: Guilford Press.
Klein, R. K., & Schermer, V. L. (2000). Group psychotherapy for psychological trauma. New York: Guilford Press. View