Diagnostic accuracy of brief PTSD screening instruments in military veterans.

Post-traumatic stress disorder (PTSD) is prevalent but is under-detected and under-treated, despite available efficacious treatments. To improve detection rates, screening instruments such as the PTSD Checklist (PCL) and the Primary Care-PTSD (PC-PTSD) screen have been widely used. However, validation of these screening instruments among patients seeking treatment in substance use disorder (SUD) specialty treatment clinics and general mental health (MH) treatment clinics is limited. Therefore, this study assessed the area under the ROC curve (AUC), sensitivity, specificity, efficiency, and positive and negative predictive values of the PCL, PC-PTSD, and five abbreviated versions of the PCL in detecting PTSD among samples of patients seeking treatment in SUD specialty treatment (n=158) and general MH treatment settings (n=242). A computer-assisted structured diagnostic interview (C-DIS-IV) was used to ascertain patient DSM-IV PTSD diagnostic status. Based on the C-DIS-IV, prevalence of PTSD was found to be 36.7 and 52.9% in the SUD and MH samples, respectively. The PCL, PC-PTSD, and five abbreviated versions of the PCL were found to have adequate psychometric properties for screening patients in SUD (AUC ranged from 0.80 to 0.86) and MH (AUC ranged from 0.77 to 0.80) outpatient treatment settings.