Psychometric properties of the Mississippi Scale for Combat-Related Posttraumatic Stress Disorder based on veterans’ period of service.

= .000; therefore, analyses were conducted with the entire sample and with each POS. The instrument demonstrated high internal consistency with our sample (α = .92) and across POS (.91 to .92). Receiver operating characteristic curves identified cut-scores ranging from 86 to 112 across the POS with acceptable-to-good sensitivity (68% to 81%) and fair-to-acceptable specificity (61% to 70%), with lower scores among World War II and Korean era veterans compared with veterans from more recent conflicts. In terms of clinical implications, the M-PTSD is a brief, easily accessible, valuable screening tool for combat-related PTSD in veterans across a range of POS. Future studies should consider the methodologies utilized to diagnose PTSD and how this potentially impacts the instrument's properties. (PsycINFO Database Record (c) 2020 APA, all rights reserved).