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Contemporary models of PTSD disaggregate this disorder into sub-clusters that differentially impact functioning. Severity of different types of PTSD symptoms in the acute posttrauma period may be predictive of the course of PTSD over time. Few research studies, however, have examined the predictive utility of PTSD sub-clusters. This study sought to determine the relative predictive validity of 4 sub-clusters, namely reexperiencing, strategic avoidance, emotional numbing, and hyperarousal, assessed within 1 month of a sexual assault. Women (N=120) who had been sexually assaulted completed self-report measures at 1 and 4 months postassault. Linear regression analyses revealed that early reexperiencing and emotional numbing sub-clusters uniquely contributed to the prediction of PTSD symptoms at month 4 (strategic avoidance and hyperarousal did not). To help explain and contextualize these findings, we explored the extent to which posttraumatic cognitions mediated the relationship between acute reexperiencing and emotional numbing and later PTSD symptoms. Simultaneous multiple mediation analyses revealed that general negative cognitions about the self significantly mediated the relationship between both reexperiencing and emotional numbing and month 4 PTSD symptoms. These findings have significant clinical implications, pointing to the importance of targeting posttraumatic cognitions in the acute posttrauma phase. (PsycINFO Database Record Language: en

BACKGROUND: Comorbidity in psychological disorders is common following exposure to a traumatic event. Relatively little is known about the manner in which changes in the symptoms of a given type of psychological disorder in the acute period following a trauma impact changes in symptoms of another disorder. This study investigated the relationship between changes in posttraumatic stress disorder (PTSD), depression, and anxiety symptoms in the first 12 weeks following sexual assault. METHODS: Participants were 126 women who had been sexually assaulted in the previous 4 weeks. RESULTS: Lower level mediation analyses revealed that changes in PTSD symptoms had a greater impact on changes in depression and anxiety than vice versa. CONCLUSIONS: The finding highlights the role of PTSD symptoms in influencing subsequent change in other psychological symptoms. These findings are discussed in the context of models detailing the trajectory of psychological disorders following trauma, and clinical implications are considered. Language: en