Development and validation of a measure of PTSD-related psychosocial functional impairment: The Inventory of Psychosocial Functioning.

This study describes the three-phase development and validation of the Inventory of Psychosocial Functioning (IPF), an 80-item, self-report measure of posttraumatic stress disorder (PTSD)-related psychosocial functional impairment. In Phase I, we conducted 12 focus groups with male and female veterans (n = 53) to identify and operationalize the domains of psychosocial impairment associated with PTSD. This information was used to develop the IPF. We subsequently evaluated the psychometric properties of the newly developed inventory in Phases II (n = 276) and III (n = 368) using two independent samples of veterans. We found that the overall IPF score demonstrated stronger correlations with measures of mental health-related impairment (all rs > |.39|; all ps < .05) and weaker correlations with measures of physical health-related impairment (all rs < |.29|; all ps < .05). Overall IPF scores were most strongly associated with PTSD and other disorders associated with the anxious-misery factor of the three-factor model of psychiatric comorbidity (all rs > .56; all ps < .05) and less strongly associated with disorders associated with the fear factor (all rs < .48; all ps < .05) and the externalizing factor (r = .16; p < .05). The IPF demonstrated strong test-retest reliability (r = .77; p < .05). Our results suggest that the IPF is a valid and reliable measure of PTSD-related psychosocial functional impairment. (PsycINFO Database Record (c) 2018 APA, all rights reserved).