Prevalence of Post-traumatic Stress Disorder and Trauma Symptoms in a General Population Sample

The goal of this observational study is to learn about how many people have post-traumatic stress disorder and related symptoms in the general population of people without any mental illness in the Barcelona region of Catalonia, Spain. The main questions it aims to answer are: * What is the prevalence of post-traumatic stress disorder in a sample of healthy controls without other mental disorders? * What is the prevalence of trauma-related symptoms in a sample of healthy controls without mental illness? * What is the prevalence of dissociative symptoms (including symptoms of depersonalisation and somatoform dissociation) in a sample of healthy controls without mental illness? * What is the prevalence of recent and childhood traumatic life events in a sample of healthy controls without mental illness? * What is the prevalence of difficulties in psychosocial functioning in healthy controls without mental illness? * What is the prevalence of depressive symptoms in healthy controls without mental illness? * What is the prevalence of general psychiatric symptoms in healthy controls without mental illness? Participants will be asked to take part in an online screening programme, and then to come to an interview with a clinician who will apply validated scales to test the above.