The distinctiveness of prolonged grief and posttraumatic stress disorder in adults bereaved by the attacks of September 11th.

Prolonged Grief Disorder (PGD) is a new diagnosis proposed for inclusion in the DSM-V. Although some studies have shown the distinctiveness of PGD and posttraumatic stress disorder (PTSD), this relationship has yet to be tested within a context of sudden, violent loss.We conducted an exploratory factor analysis (EFA) using self-report data collected from a sample of 587 bereaved adults who lost friends and relatives in the attacks of September 11th. Participants completed a 9-item PGD screening measure and the 17-item PTSD Checklist.A five factor solution representing two distinct constructs emerged from our analysis. Although two PGD items loaded onto factors containing PTSD symptoms, these items assessed non-specific symptomatology (i.e., generalized negative affect). Thus, overall, our results support the distinctiveness of PGD and PTSD within a context of sudden, violent loss.Data were collected using self-report. The representativeness of our sample is uncertain.These findings provide a stringent test of construct validity and suggest that PGD warrants inclusion in the diagnostic nosology. Adding PGD to the DSM-V will help clinicians better assess and treat psychopathology resulting from grief.