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Supplemental material, sj-docx-1-anp-10.1177_00048674231165201 for Prevalence and correlates of addictive eating behaviours in a large cohort of Australian adolescents by Scarlett Smout, Lauren A Gardner, Katrina E Champion, Bridie Osman, Ivana Kihas, Louise Thornton, Maree Teesson, Nicola C Newton and Tracy Burrows in Australian & New Zealand Journal of Psychiatry

Introduction: Post-traumatic stress disorder (PTSD) and substance use disorder frequently co-occur and tend to have their onset during adolescence. Although research has highlighted the importance of treating these disorders in an integrated fashion, there is a dearth of empirically validated integrated treatment options for adolescents with this comorbidity. This paper describes the study protocol for a randomised controlled trial (RCT) examining the efficacy of an integrated trauma-focused cognitive–behavioural treatment for traumatic stress and substance use among adolescents (Concurrent Treatment of PTSD and Substance Use Using Prolonged Exposure - Adolescent (COPE-A)), relative to a supportive counselling control condition (Person-Centred Therapy (PCT)). Methods and analysis: A two-arm, parallel, single-blind RCT with blinded follow-up at 4 and 12 months poststudy entry will be conducted in Sydney, Australia. Participants (n~100 adolescents aged 12–18 years) and their caregivers (caregiver participation is optional) will be allocated to undergo either COPE-A or PCT (allocation ratio 1:1) using minimisation. Both therapies will be delivered individually by project psychologists over a maximum of 16 sessions of 60–90 min duration and will include provision of up to four 30 min optional caregiver sessions. The primary outcome will be between-group differences in change in the severity of PTSD symptoms from baseline to 4-month follow-up, as measured by the Clinician-Administered PTSD Scale for Children and Adolescents for DSM-5. Ethics and dissemination: Ethical approval has been obtained from the human research ethics committees of the Sydney Children’s Hospital Network (HREC/17/SCHN/306) and the University of Sydney (HREC 2018/863). Findings will be published in peer-reviewed journals and presented at scientific conferences. Trial registration number: ACTRN12618000785202; Pre-reults.

â Activate participant information and consent formâ â This file provides a model of the information and consent form used in the trial (DOC 293 kb)

â Activate participant information and consent formâ â This file provides a model of the information and consent form used in the trial (DOC 293 kb)

â Groups overseeing the trial, insurance coverage provided by UNSW, and authorship guidelinesâ â This document outlines the role and composition of groups overseeing the trial, the insurance coverage provided by UNSW and the authorship guidelines that will be used for papers based on trial data (DOCX 16 kb)

â Groups overseeing the trial, insurance coverage provided by UNSW, and authorship guidelinesâ â This document outlines the role and composition of groups overseeing the trial, the insurance coverage provided by UNSW and the authorship guidelines that will be used for papers based on trial data (DOCX 16 kb)