Perceived social support and posttraumatic stress symptoms in children and youth in therapy: A parallel process latent growth curve model.

Many studies show that perceived social support protects against the development of posttraumatic stress symptoms (PTSS) in the aftermath of trauma, but less is known about support in relation to PTSS in trauma therapy. This study examined associations between perceived social support and PTSS in children and adolescents during trauma therapy. Parallel process latent growth curve modeling was used to examine trajectories of perceived social support and PTSS over five measurement waves in a sample of 156 patients, aged between 10 and 18 years (M age = 15.1, SD = 2.2, 79.5% girls), randomized to receive trauma-focused cognitive behavior therapy (TF-CBT) or therapy-as-usual (TAU). Across all participants there was an average decline in PTSS and increase of perceived social support from pre-therapy to 18 months after therapy. Most of the change occurred during therapy and was maintained after therapy. Higher levels of PTSS prior to therapy were associated with lower levels of perceived social support prior to therapy, and a decrease in PTSS was associated with increase in perceived social support. This co-development may have been directed by a third underlying factor or short-term temporal effects. Studies investigating within-person associations over shorter time intervals will benefit our understanding of possible temporal effects.