Longitudinal associations between posttraumatic stress disorder, separation anxiety, and rumination among adolescents: Disentangling within-person and between-person associations.

Posttraumatic stress disorder (PTSD) and separation anxiety often show high comorbidity after trauma, which complicates the course of disease and treatment response. However, it is unclear how PTSD and separation anxiety comorbidity occur. According to the cognitive model of PTSD, rumination may be a key cognitive process linking the two constructs. Thus, this study aimed to examine the relation between PTSD and separation anxiety and to assess the mediating role of rumination in this relation among adolescents after trauma.