A longitudinal investigation of trauma-specific rumination and PTSD symptoms: The moderating role of interpersonal trauma experience

Interpersonal trauma (IPT) is one of the most commonly reported types of traumatic experiences and has the greatest likelihood of resulting in a diagnosis of posttraumatic stress disorder (PTSD). Relative to other types of trauma, victims of IPT report greater trauma-specific rumination, whereby they focus on negative consequences of the trauma on their life. Theoretical and empirical work suggest trauma-specific rumination leads to elevated posttraumatic stress symptoms (PTSS); however, there has been a dearth of research examining how trauma type may impact this association. Therefore, the current longitudinal study examined how the experience of IPT moderates the relationship between trauma-specific rumination and later PTSS.Participants (N = 204) enrolled in a clinical trial completed self-report measures of trauma experience, trauma-specific rumination, and PTSS at baseline and 1-month follow-up appointments.Results revealed that IPT moderated the relationship between baseline rumination and 1-month trauma symptoms, even after covarying for participant age and sex, treatment condition, negative affect, and number of previously experienced traumas. Further, this moderation effect was specific to the PTSD numbing cluster.Major limitations include measurement of PTSS via PCL-C rather than the PCL-5, as well as a limited sample size, precluding moderation analyses of other trauma types.The current study provides novel findings demonstrating specificity of index trauma type in the longitudinal relationship between rumination and PTSS. Future work is needed to examine how IPT impacts the development of pathways between rumination and PTSS.