1 Title: Predicting suicidal risk in a cohort of depressed children and adolescents. Authors: Sarah E. Hetrick 1* , Alexandra G. Parker 1 , Jo Robinson 1 , Nicole Hall 2 , Alasdair Vance 2 Affiliation: 1. Orygen Youth Health Research Centre, Centre for Youth Mental Health, University of Melbourne, Locked Bag 10, Parkville, Victoria 3052, Australia 2. Academic Child Psychiatry Unit, Department of Paediatrics, University of Melbourne and Royal Children's Hospital and Murdoch Childrens Research Institute, Parkville, Victoria, Australia * The study reported here was conducted as part of the DPsych research of the first author, at the Academic Child Psychiatry Unit, under the supervision of the fifth author. Corresponding author: Sarah E Hetrick, Orygen Youth Health Research Centre, Centre for Youth Mental Health, University of Melbourne, Locked Bag 10, Parkville, Victoria 3052, Australia. Tel: + 61 3 8387 2274; Fax: +61 3 8387 2466; Email: shetrick@unimelb.edu.au Author biographies: Sarah Hetrick, DPsych, is a clinical psychologist and Senior Research Fellow at Orygen Youth Health Research Centre, Centre of Youth Mental Health, Melbourne University. She undertakes evidence synthesis and holds an NHMRC training fellowship focused on evidence implementation for youth depression. She is a lead investigator on several research projects. Alexandra Parker, PhD MPsych, is clinical psychologist and Research Fellow at Orygen Youth Health Research Centre, Centre of Youth Mental Health, Melbourne University. Her research focus is on early intervention in youth mental health. She has also undertaken evidence synthesis regarding interventions across mental health disorders affecting young people. Jo Robinson, is a Research Fellow at Orygen Youth Health Research Centre, Centre of Youth Mental Health, Melbourne University, where she leads a research program specialising in youth suicide prevention. She is also undertaking her PhD (University of Melbourne) examining the effects of a web-based intervention on at-risk youth. Nicole Hall, DPsych, is a clinical psychologist and research officer at the Academic Child