Effectiveness of Collaborative, Trauma-Informed Care on Depression Outcomes in Primary Care: A Cluster Randomized Control Trial in Chile.

Purpose: The purpose of this study was to evaluate the effectiveness of collaborative trauma-informed care (CTIC) for treating depression in primary care in Chile.

Methods: From August 2021 through June 2023, 16 primary care teams in the Maule Region of Chile, were randomly assigned to either the CTIC or usual treatment (UT) group. At baseline, 3 months, and 6 months, 115 patients in the CTIC group, and 99 in the UT group, were blindly evaluated. The primary outcome was reduction in depressive symptoms. Secondary outcomes included improvement in anxiety symptoms, interpersonal and social functioning, emotional regulation, and adherence. Intention-to-treat data analysis, using analysis of covariance was conducted.

Results: There were 214 patients recruited; 85% were women, and 61% had 4 or more adverse childhood experiences. At 6 months, depressive symptoms declined significantly in the CTIC arm relative to UT (adjusted mean difference [AMD]= -3.09, 95% CI, -4.94 to -1.23; d = -0.46, 95% CI,-0.73 to -0.18; P = .001). Anxiety symptoms exhibited a trend toward improvement in the CTIC vs UT group (AMD = -1.50, 95% CI, -3.03 to 0.31; P = .055). No significant differences were observed in other secondary outcomes, except for adherence, which was significantly higher in the CTIC vs UT groups (AMD = 2.59, 95% CI, 1.80-4.99; P = .035).

Conclusions: The CTIC approach demonstrated superior outcomes in treating depression and improving adherence compared with UT. Moreover, the observed trends in anxiety improvement warrant further exploration in future research with a larger sample size. It is necessary to assess the effectiveness of this approach in treating more complex, difficult-to-treat forms of depression.