TRAILS consists of a population cohort (N1/42230) and a clinical cohort (N1/4543), both of which were followed from about age 11 years onwards. To date, the population cohort has been assessed five times over a period of 11 years, with retention rates ranging between 80% and 96%. The clinical cohort has been assessed four times over a period of 8 years, with retention rates ranging between 77% and 85%. Since the IJE published a cohort profile on the TRAILS in 2008, the participants have matured from adolescents into young adults. The focus shifted from parents and school to entry into the labour market and family formation, including offspring. Furthermore, psychiatric diagnostic interviews were administered, the database was linked to a Psychiatric Case Registry, and the availability of genome-wide SNP variations opened the door to genome-wide association studies regarding a wide range of (endo)phenotypes. With some delay, TRAILS data are available to researchers outside the TRAILS consortium without costs; access can be obtained by submitting a publication proposal (see

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International Journal of Epidemiology
Department of Child and Adolescent Psychiatry and Psychology

Oldehinkel, A., Rosmalen, J., Buitelaar, J., Hoek, H., Ormel, J. H., Raven, D., … Hartman, C. (2015). Cohort profile update: The tracking adolescents' individual lives survey (TRAILS). International Journal of Epidemiology, 44(1), 76–76n. doi:10.1093/ije/dyu225