Adolescent depression: prevalence in Swedish high-school students

Area of Science:

• Adolescent Psychiatry
• Mental Health Research
• Epidemiology of Mood Disorders

Background:

• Adolescent depression is a significant public health concern.
• Understanding the prevalence and characteristics of depression in high school students is crucial for early intervention.
• Previous suicide attempts are a critical indicator for mental health assessment in youth.

Purpose of the Study:

• To determine the 1-year and lifetime prevalence of major depression in a Swedish high school population.
• To investigate the prevalence of dysthymia and hypomanic episodes in adolescents.
• To examine gender differences in the prevalence of depressive disorders.

Main Methods:

• Screening of 2300 high school students (aged 16-17) in a Swedish town for depression and suicide attempts.
• Diagnostic interviews using the Diagnostic Interview for Children and Adolescents-Revised (DICA-R-A) for participants with high depression scores, previous suicide attempts, and matched controls.
• Inclusion of 93.3% of the screened population and 88.8% of those selected for interviews.

Main Results:

• The 1-year prevalence of major depression was 5.8%, and the lifetime prevalence was 11.4%.
• Major depression was diagnosed in four girls for every boy.
• Dysthymia affected 2% of students (two girls for every boy), and short hypomanic episodes were present in 13.2% of those with a lifetime diagnosis of major depression.

Conclusions:

• Major depression is a common mental health issue among Swedish high school students, particularly affecting girls.
• A significant proportion of adolescents experience major depression over their lifetime.
• The findings highlight the need for accessible mental health services and targeted prevention strategies for adolescent depression.