Validation of a Brief PTSD Screener for Underserved Patients in Federally Qualified Health Centers
Published in: General Hospital Psychiatry, v. 38, Jan.-Feb. 2016, p.84-88
Posted on RAND.org on January 15, 2016
OBJECTIVE: To validate the reliability and efficiency of alternative cutoff values on the abbreviated six-item Posttraumatic Stress Disorder (PTSD) Checklist (PCL-6)  for underserved, largely minority patients in primary care settings of Federally Qualified Health Centers (FQHCs). METHOD: Using a sample of 760 patients recruited from six FQHCs in the New York City and New Jersey metropolitan area from June 2010 to April 2013, we compared the PCL-6 with the Clinician Administered PTSD Scale (CAPS) for the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition. We used reliability statistics for single cutoff values on PCL-6 scores. We examined the relationship between probabilities of meeting CAPS diagnostic criteria and PCL-6 scores by nonparametric regression. RESULTS: PCL-6 scores range between 6 and 30. Reliability and efficiency statistics for cutoff between 12 and 26 were reported. There is a strong monotonic relationship between PCL-6 scores and the probability of meeting CAPS diagnostic criteria. CONCLUSION: No single cutoff on PCL-6 scores has acceptable reliability on both false positive and false negative simultaneously. An ordinal decision rule (low risk: 12 or less, medium risk: 13 to 16, high risk: 17 to 25 and very high risk: 26 and above) can differentiate the risk of PTSD. A single cutoff (17 or higher as positive) may be suitable for identifying those with the greatest need for care given limited mental health capacity in FQHC settings.