Transdiagnostic versus disorder-specific and clinician-guided versus self-guided internet-delivered treatment for Social Anxiety Disorder and comorbid disorders: A randomized controlled trial

Disorder-specific (DS-CBT) and transdiagnostic (TD-CBT) cognitive behaviour therapy have both been used to treat social anxiety disorder (SAD). This study compared internet-delivered DS-CBT and TD-CBT for SAD across clinician-guided (CG-CBT) and self-guided (SG-CBT) formats. Participants with SAD (n=233) were randomly allocated to receive internet-delivered TD-CBT or DS-CBT and CG-CBT or SG-CBT. Large reductions in symptoms of SAD (Cohen's d >= 1.01; avg. reduction >= 30%) and moderate-to-large reductions in symptoms of comorbid depression (Cohen's d >= 125; avg. reduction >= 39%), generalised anxiety disorder (Cohen's d >= 0.86; avg. reduction >= 36%) and panic disorder (Cohen's d >= 0.53; avg. reduction >= 25%) were found immediately post-treatment and were maintained or further improved to 24-month follow-up. No marked differences were observed between TD-CBT and DS-CBT or CG-CBT and SG-CBT highlighting the potential of each for the treatment of SAD and comorbid disorders. (C) 2016 The Author(s). Published by Elsevier Ltd.