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Longitudinal studies are also widely used in other medical and social science fields. For instance, in cardiovascular research, they can monitor patients' health over decades to identify risk factors for heart disease, such as high cholesterol or smoking, and evaluate the long-term effectiveness of preventive measures. Similarly, in mental health studies, researchers might follow individuals from adolescence into adulthood to understand the development and progression of conditions like...
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Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...
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Depressant drugs, including alcohol and sedative-hypnotics, diminish central nervous system activity by enhancing the action of gamma-aminobutyric acid (GABA), a neurotransmitter that reduces brain activity and promotes relaxation. These substances can have various therapeutic uses but also pose significant risks, especially when misused or combined.
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Uppsala Longitudinal Adolescent Depression Study (ULADS).

Iman Alaie1, Anna Philipson2, Richard Ssegonja3

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Adolescent depression, affecting 11.4%, often recurs and leads to long-term issues like poor educational attainment and mental health conditions. This longitudinal study tracks these outcomes into adulthood.

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Area of Science:

  • Psychiatry
  • Epidemiology
  • Developmental Psychology

Background:

  • The Uppsala Longitudinal Adolescent Depression Study (ULADS) began in the early 1990s in Sweden.
  • Initial focus on adolescent depression prevalence, characteristics, and correlates.
  • Expanded to include long-term social, economic, and health outcomes, plus cost-of-illness analyses.

Purpose of the Study:

  • To present the Uppsala Longitudinal Adolescent Depression Study (ULADS).
  • To investigate the prevalence, characteristics, and correlates of adolescent depression.
  • To analyze long-term social, economic, and health-related outcomes and associated costs.

Main Methods:

  • Screened 2300 first-year upper-secondary students (aged 16-17) in Uppsala (1991-1992).
  • Conducted comprehensive assessments on 631 adolescents (78% female) and a 15-year follow-up on 409.
  • Utilized Swedish national registries for social, economic, and health data (1993 onwards) for 576 participants and a reference population.

Main Results:

  • Estimated adolescent lifetime prevalence of major depressive episode at 11.4%.
  • Majority experienced recurrence in young adulthood; persistent depression or somatic symptoms indicated a poor prognosis.
  • Adolescent depression linked to increased adult risks: mental health conditions, lower educational attainment, and relationship problems.

Conclusions:

  • Longitudinal studies on adolescent depression are crucial but rare.
  • Continuous registry-based follow-up is planned as participants approach mid-adulthood.
  • Focus is on the long-term burden of adolescent depression, incorporating health economics expertise and seeking collaborations.