Long-term effects of a collaborative care intervention on process of care in family practices in Germany: a 24-month follow-up study of a cluster randomized controlled trial.

Objective: The aims of this study were (1) to assess the long-term effects of a collaborative care intervention for patients with depression on process of care outcomes, and (2) to describe whether case management was continued after the end of the original one-year intervention.
Methods: This 24-month follow-up of a randomized controlled trial took place 12 months after the end of the 1-year intervention. Data collection occurred by means of self-rating questionnaires and from medical records. We calculated linear mixed and logistic generalized estimating equation models.
Results: Of the 626 patients included at baseline, 439 (70.1%) participated in this follow-up. Intervention recipients gave higher ratings than control recipients in terms of mean overall Patient Assessment of Chronic Illness Care (PACIC) scores (3.12 vs. 2.86; P = .019), but no difference was found in medication adherence (mean Morisky score 2.59 vs. 2.65, P = .56), prescribed antidepressant medications (60.2% vs. 55.1%; P = .25), visits to the family physician (15.96 vs. 14.46, P = .58) or mental health specialist (3.01 vs. 2.94, P = .94) over the 12 month follow-up period. Case management was continued for 47 (22.5%) selected intervention patients after the original intervention had ended.
Conclusion: At 24 months, intervention and control recipients had different PACIC ratings, but other process of care outcomes did not differ.
Practice Implications: The main effects of the intervention are apparent at 12 months.
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