A single question to screen for major depression in the general population

Area of Science:

• Psychiatry
• Epidemiology
• Public Health

Background:

• Major depression is a common mental health condition that is often underdiagnosed.
• Early identification of major depressive disorder is crucial for timely intervention and treatment.

Purpose of the Study:

• To evaluate the effectiveness of a single screening question in identifying current major depressive disorder within the general population.
• To assess the utility of this question as a clinical indicator for major depression.

Main Methods:

• Utilized data from the National Epidemiological Survey on Alcohol and Related Conditions (NESARC), a large-scale survey of US adults.
• Analyzed the diagnostic characteristics (sensitivity, specificity, predictive values, likelihood ratios) of the question: 'During the past 4weeks, how often did you felt downhearted and depressed?' for detecting DSM-IV major depressive disorder.

Main Results:

• Participants reporting feeling downhearted and depressed more frequently (even 'a little of the time') were significantly more likely to be diagnosed with major depressive disorder.
• The likelihood ratio for a positive test indicated a substantial increase in the probability of major depression, particularly when symptoms were reported 'most' or 'all' of the time.
• A positive response to the screening question could elevate the pretest probability of major depression significantly.

Conclusions:

• A single screening question about depressive feelings demonstrates potential as an effective tool for identifying major depressive disorder.
• The findings suggest this simple screening method could be valuable in primary care settings for early detection of depression.