The purpose of this randomized controlled trial was to test an internet-delivered version of cognitive processing therapy (CPT) for the psychological distress associated with bullying victimization. The sample comprised 52 adults (i.e. 69.20% women; mean age = 43.37 (SD = 12.47); 3.85% ethnic minority) who self-identified as having a lifetime history of bullying victimization. Participants were randomized into three groups, which received 12 sessions of internet-delivered, therapist-guided, and content-modified version of CPT, 12 sessions of internet-delivered and therapist-guided stress management (SM), or a waitlist. Treatment outcomes included maladaptive trauma appraisals, symptoms of posttraumatic stress disorder (PTSD), depression, general anxiety and stress, social anxiety, and anger. Hierarchical linear modeling was used to analyse the data. Findings indicated that CPT was effective in reducing the strength of maladaptive appraisals related to bullying victimization and symptoms of PTSD compared to the waitlist and SM. SM outperformed CPT and the waitlist in reducing symptoms of depression, general anxiety, and stress. In conclusion, the results of this trial suggest that internet-delivered CPT is effective for the psychological distress and maladaptive appraisals associated with bullying victimization but that adaptions might be needed to target more effectively symptoms of anxiety and depression.
Keywords: Bullying victimization; cognitive processing therapy; stress management therapy; trauma.