1 Trajectory of Post-traumatic Stress and Depression among Children and Adolescents Following Single-incident trauma Joyce Zhang a, Richard Meiser-Stedman a, Bobby Jones b, Patrick Smith c, Tim Dalgleish d,j , Adrian Boyle e, Clare Dixon f, Lysandra Sinclaire-Harding g, Susanne Schweizer i, Jill Newby h, Anna McKinnon j aDepartment of Clinical Psychology, University of East Anglia, UK; bDepartment of Psychiatry, University of Pittsburgh, United States; cDepartment of Psychology, Institute of Psychiatry, Psychology and Neuroscience, King’s College, London, UK; dMedical Research Council Cognition and Brain Sciences Unit, University of Cambridge, UK; jCambridgeshire and Peterborough NHS Foundation Trust, UK; eEmergency Department, Addenbrooke’s Hospital, Cambridge, UK; fSussex Partnership NHS Foundation Trust, UK; gFaculty of Education University of Cambridge, UK; hSchool of Psychiatry, University of New South Wales, Australia; iSchool of Psychology, University of New South Wales, Australia; jDepartment of Psychology, Macquarie University, Australia. Corresponding author: Joyce Zhang, Department of Clinical Psychology, University of East Anglia, Norwich Medical School, Norwich Research Park, NR4 7TJ, Norwich, UK; Email:
[email protected] Acknowledgements: This research received no specific grant from any funding agency, commercial or not-for-profit sectors. The authors have declared that they have no competing or potential conflicts of interest. 2 Trajectory of Post-traumatic Stress and Depression among Children and Adolescents Following Single-incident trauma: Courses and Risks Abstract Objective : PTSD-depression has high comorbidity and understanding their relationship is of clinical and theoretical importance. A comprehensive way to understand post- trauma psychopathology is through symptom trajectories. The study aimed to look at the developmental courses of PTSD and depression symptoms in the initial months post- trauma, and their interrelationship in children and adolescents by utilizing advanced group-based trajectory modeling (GBTM).