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Clinician Administered PTSD Scale (CAPS) (Blake et al., 1990)
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Most widely used measure of PTSD (Weathers et al., 2001)
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Assesses all DSM-IV PTSD symptoms, impact on functioning, response validity, lifetime diagnosis, and overall PTSD severity
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Original version, based on DSM-III-R criteria: CAPS-1 (current and lifetime diagnosis, symptoms over past, or worst month since trauma) CAPS-2 (symptoms over past week for repeated assessments)
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DSM-IV revision with user feedback incorporated: CAPS-1 renamed CAPS-DX (diagnostic version) and CAPS-2 renamed CAPS-SX (symptom status version)
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Current version, CAPS, combined CAPS-1 and CAPS-2
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Structured interview
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45–60 minute administration by trained (para)professionals
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34 items (17 items on frequency, 17 items on intensity)
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Dichotomous (diagnosis present/ absent) and continuous assessment
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Five-point Likert ratings of symptom severity (0–4)
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Time frames for assessment include: past week, month, or worst month since trauma
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Initially validated on combat veterans, subsequently applied in a wide variety of trauma populations including victims of rape, crime, motor vehicle accidents, incest, torture, and cancer (Weathers et al., 2001)
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Confirmatory factor analyses supported fit of two-factor structure (Buckley et al., 1998):
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Intrusion and avoidance, hyperarousal, and numbing
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Confirmatory factor analyses comparing solutions suggested an oblique 4-factor, first-order solution as the best fit to data (King et al., 1998):
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Reexperiencing, effortful avoidance, emotional numbing, hyperarousal
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