Intervention to Prevent Major Depression in Primary Care: A Cluster Randomized Trial

Area of Science:

• Public Health
• Clinical Psychology
• Preventive Medicine

Background:

• Universal prevention of depression in adults remains understudied.
• Major depressive disorder is a significant public health concern.

Purpose of the Study:

• To evaluate the effectiveness of a primary care-based intervention designed to prevent major depression in adults.
• To assess the impact of personalized risk communication and tailored psychosocial programs on depression incidence.

Main Methods:

• A multicenter, cluster randomized trial involving 3326 eligible adult patients across 70 primary care centers in Spain.
• Patients were randomized to either usual care or an intervention group where primary care physicians (PCPs) communicated individual depression risk and implemented tailored psychosocial programs.
• Depression incidence was assessed every six months for 18 months.

Main Results:

• At 18 months, the incidence of major depression was 7.39% in the intervention group versus 9.40% in the control group, a nonsignificant absolute difference of -2.01 percentage points (P = 0.070).
• The intervention demonstrated a trend towards lower depression incidence, with significant reductions observed in 5 of the 7 cities studied.

Conclusions:

• A primary care-based intervention utilizing personalized risk predictors for depression prevention yielded a modest, though statistically nonsignificant, reduction in major depression incidence.
• Potential self-selection bias due to patient non-consent was a limitation.
• Further research into this approach for adult depression prevention is warranted.