The target population consists of the dynamic cohort of all Catalan residents during the 6-year period 2014-2019. Annual total population of Catalonia is between 7.5-7.6 million, with annual rates for immigration, emigration, birth and death being ~2.5%, ~1.9%, ~0.9%, and ~0.8%, respectively. Based on these figures, we expect a maximum of ~9.1 million individuals with Catalan residency status on at least one point in time over the 2014-2019 period. However, we expect SA in Catalonia to be extremely rare before the age of 10, in line with findings that self-injurious behaviour generally occurs as from the adolescent period. We will therefore exclude cases and controls that have not reached age 10 by the end of the 2014-2019 period (i.e., ~10.9%), lowering the total expected target population to ~8.1 million.

• sociodemographic variables
• history of self-injurious behaviours; all types of somatic conditions; neurodevelopmental, mental, behavioural, personality and substance use disorders; all types of medical procedures performed; and number and type of healthcare contacts.
• prescriptions for psychopharmacological products
• the Suicidal Scale of the Mini-International Neuropsychiatric Interview, the type and lethality of the attempt that warranted evaluation, presence and type of mental disorder, hopelessness, impulsivity, aggressiveness, altered state of conscience, use or dependence of alcohol, use or dependence of illicit drugs, serious somatic disease (including chronic diseases, chronic pain, and disabilities), living status, presence of family or social support, social problems, stressful life events, access to lethal means, and family history of suicide

Suicide attempt is a nonfatal, self-directed, potentially injurious behaviour with a non-zero degree of intent to die as a result of the behaviour, even if the behaviour does not result in injury

Suicide is a fatal, self-directed, injurious behaviour with a non-zero degree of intent to die as a result of the behaviour