Depressive disorders in primary care: prevalence, functional disability, and identification

Area of Science:

• Primary care research
• Mental health screening
• Depression epidemiology

Background:

• Depression is a prevalent condition in primary care settings.
• Distinguishing between major depressive disorder (MDD) and subsyndromal depression (SubD) is crucial for effective management.
• Assessing functional impairments associated with different depression severities is important for patient outcomes.

Purpose of the Study:

• To determine the prevalence of SubD and MDD in primary care.
• To describe the functional impairments linked to SubD and MDD.
• To evaluate the performance of a short depression screen (SDS).

Main Methods:

• Study conducted in three diverse primary care clinics.
• 221 adult patients aged 30+ years, without prior psychiatric conditions, were randomly selected.
• Interviewer-administered SDS and SF-36, alongside physician-administered SCID and HDRS, were used for diagnosis and assessment.

Main Results:

• Prevalence rates: MDD at 4% and SubD at 16%.
• Both MDD and SubD groups exhibited significant functional impairments compared to controls.
• SDS demonstrated 100% sensitivity and 72% specificity for MDD, but 66% sensitivity and 79% specificity for all depressive disorders (MDD or SubD).

Conclusions:

• SubD is more prevalent than MDD in primary care.
• Both MDD and SubD are associated with substantial functional impairment.
• The SDS is a useful tool but has limitations in detecting all depressive disorders.