On the concordance between CAPS-5 and PCL-5 scores

Area of Science:

• Psychiatry
• Psychological Assessment
• Traumatic Stress Studies

Background:

• Investigated score discrepancies between the Clinician-Administered PTSD Scale for DSM-5 (CAPS-5) and the PTSD Checklist for DSM-5 (PCL-5).
• Utilized data from four clinical trials involving active-duty military personnel and veterans.
• Replicated the common finding of higher PCL-5 scores compared to CAPS-5 scores.

Purpose of the Study:

• To analyze item response distributions of the CAPS-5 and PCL-5.
• To evaluate the implications of observed score differences between the two PTSD measures.
• To offer an alternative perspective on the findings and conclusions presented by Resick et al. (2023).

Main Methods:

• Analysis of item response distributions from existing clinical trial data.
• Comparison of scoring patterns between a clinician-rated interview (CAPS-5) and a self-report questionnaire (PCL-5).
• Critical review of the authors' interpretation of score discrepancies and proposed revisions.

Main Results:

• PCL-5 ratings showed more even distribution across response options.
• CAPS-5 scores were utilized less frequently across its response options.
• The study challenges the conclusion that score differences indicate a problem requiring revision of the measures.

Conclusions:

• The authors' characterization of the CAPS-5 and PCL-5 may be inaccurate.
• Conclusions drawn from the score discrepancies may be erroneous.
• An alternative perspective is provided regarding the relationship between the CAPS-5 and PCL-5 in PTSD assessment.