The goal of this observational study is to increase our knowledge about the mental health of young individuals and to establish a valid and comprehensive method for assessing mental health in young individuals (15-29 years) that can improve our capacity to promote mental health and address mental health problems. The specific aims of the proposed project are: 1) To determine the extent and course of mental health in young men and women over a two-year period and discern the added value of multimodal data to assess and predict mental health problems. 2) To demonstrate the feasibility of different assessment methods of mental health in young individuals. Participants will be able to provide: * Survey data - mental health outcome measures are used to assess mental well-being and mental health problems, and sociodemographic and individual health data are collected to explore potential confounders with the primary outcomes. * Behavioral testing - online/remote behavioral assessments such as approach-avoidance conflict, emotional regulation, risk-taking-attitude and cognitive tests. * National register data - sociodemographic data including age, country of birth, education, school absence, sickness absence and income, inpatient (hospital) and outpatient specialist care, information on e.g. psychiatric conditions and pain conditions and psychiatric care and use of psychotropic medication. * Blood-based biological marker - monitoring of about 800 biomarkers, carefully selected to target the most important metabolic pathways, including steroid-, hormone-, neurotransmitter- and lipid regulation. * Passive data by digital phenotyping - automatically collected data from for example smartphone sensors and activity logs. * App- and survey metadata - app usage, when a survey was opened, time taken to answer separate measures and questions, completion of full survey, and any changes made in survey responses. Researchers will compare 3 different assessment protocols, with participants providing data at different time points, this in order to see demonstrate feasibility and methods for future studies on mental health in young individuals. Establishment of feasibility is done by collecting data on: recruitment rate, adherence and acceptance of study procedures including mode of data collection.
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Change in anxiety symptoms
Timeframe: Baseline, 1 year, 2 year for Group 1 and 3
Change in anxiety symptoms
Timeframe: Baseline, 6 months, 1 year, 1.5 years, 2 year for Group 2
Change in depressive symptoms
Timeframe: Baseline, 1 year, 2 year for Group 1 and 3
Change in depressive symptoms
Timeframe: Baseline, 6 months, 1 year, 1.5 years, 2 year for Group 2
Change in well-being
Timeframe: Baseline, 1 year, 2 year for Group 1 and 3
Change in well-being
Timeframe: Baseline, 6 months, 1 year, 1.5 years, 2 year for Group 2