Motivational interviewing improves depression outcome in primary care: A cluster randomized trial

Area of Science:

• Clinical Psychology
• Primary Care Medicine
• Psychotherapy Research

Background:

• Major Depressive Disorder (MDD) is a prevalent mental health condition requiring effective treatment strategies.
• Primary care settings are crucial for initial diagnosis and management of depression.
• Motivational Interviewing (MI) is a therapeutic approach that can enhance patient engagement in treatment.

Purpose of the Study:

• To evaluate the impact of Motivational Interviewing (MI) delivered by primary care providers on depressive symptom improvement and remission rates.
• To assess the effectiveness of MI in low-income patients newly diagnosed with Major Depressive Disorder (MDD).
• To explore potential mediators of MI's effect on depressive symptoms.

Main Methods:

• Randomized controlled trial involving ten care teams: four received MI with standard depression management (MI-SMD) and six received standard management (SMD) alone.
• 88 patients in the MI-SMD group and 80 patients in the SMD group were assessed using the Patient Health Questionnaire-9 (PHQ-9) at 6, 12, and 36 weeks.
• Audio recordings of patient-provider encounters were analyzed to assess provider MI ability and patient language related to treatment engagement and mood improvement.

Main Results:

• MI-SMD demonstrated a significantly more favorable trajectory of PHQ-9 depressive symptom scores over time compared to SMD alone (p = .018).
• At 36 weeks, MI-SMD was associated with statistically significant improvements in depressive symptoms (Cohen's d = 0.41) and higher remission rates (14.53% difference).
• Provider MI skills and patient language favoring engagement in mood-improving behaviors mediated the observed improvements in depressive symptoms (p < .05).

Conclusions:

• Training primary care providers in Motivational Interviewing can enhance the standard management of depression.
• MI is an effective intervention for improving depressive symptoms and remission rates in newly diagnosed MDD patients within primary care.
• The findings support the integration of MI into primary care to improve mental health outcomes for underserved populations.