Depression is the leading cause of disability worldwide and is a major contributor to the overall global burden of disease. Further, depression is one of the most common mental health problems in young people, with an estimated prevalence of 5.6%. Most importantly, depression in young people is frequently an indicator of recurrent or chronic depression which stretches into adulthood. Thus, to recognise, prevent, and treat depression in young ages is crucial. However, a number of important issues need further investigation to aid early intervention in depression in young people. And among these, it is crucial to identify those risk factors that have greatest impact in the development of depression in young people, as these are the factors that should be targeted when designing early intervention in young people.6 Therefore, the aim of this study is to identify relevant risk factors for the development of depression in young people. To do this, we will use secondary data analyses, using the Avon Longitudinal Study of Parents and Children (ALSPAC), which comprises around 14,000 individuals recruited at birth. Risk factors to be investigated in this study include sleep, cognitive function, diet, substance abuse, childhood abuse, parenting style, academic performance, social relationships, school connectedness, or self-esteem, among others. Further, we will focus on depression symptoms occurring at several time points across adolescence (from 13 to 21 years old), using a validated questionnaire on depression (the Short Mood and Feelings Questionnaire).