The PTSD Symptom Scale (PSS-I) first published in 1993, is a semi-structured 17-item interview aiding in assessing the presence and severity of DSM-IV PTSD symptoms. The symptoms would be related to an identified traumatic event in an individual with a known trauma history. Any trained individual can administer the scale and it takes 15 to 25 minutes to complete. Each item on the scale is assessed with a brief question, there are no follow up questions.
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Reliability and Validity
The PSS-I has been validated for two different time intervals, those being the “past 2 weeks” and the “past month.” Inter-rater reliability for PTSD diagnosis (k=0.91) and overall severity (r=0.97) are both excellent. The time needed for assessing PTSD with the PSS-I scale is short without sacrificing reliability or validity.
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.
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Alvarez-Conrad, Jennifer, Foa, Edna B.; & Zoellner, Lori, A. (2001). Linguistic Predictors of Trauma Pathology and Physical Health.
Foa, Edna B. & Tolin, David F. (2000). Comparison of the PTSD Symptom Scale-Interview Version and the Clinician-Administered PTSD Scale.
Hobfoll, Stevan E.; Johnson, Robert J.; & Vranceanu, Ana-Maria. (2007). Child Multi-Type Maltreatment and Associated Depression and PTSD symptoms: The Role of Social Support and Stress.