Cost-effectiveness of community-based integrated care model for patients with diabetes and depressive symptoms

The coexistence of type 2 diabetes (T2DM) and depression is a prominent example of multimorbidity. In previous work, we reported the results of a completed cluster-randomized controlled trial that was conducted in eight community health centers in China. We enrolled adults (≥18 years) with type 2 diabetes and depressive symptoms. In the intervention group, a comprehensive care plan was developed based on the Integrated Care Model for Patients with Diabetes and Depression (CIC-PDD). In this study, we explore the cost-effectiveness of the CIC-PDD by conducting a one-year within-trial economic evaluation from the health system, multipayer and societal perspectives. Health outcomes are quality-adjusted life years (QALYs) and depression-free days (DFDs), and we calculate incremental cost-effectiveness ratios (ICERs) and cost-effectiveness probability. Among 630 participants (275 intervention, 355 usual care), the cost per QALY gained is $7,922.82, $7,823.85, and $7,409.46, with cost-effectiveness probabilities of 66.41%- 94.45%. The cost per DFD is $2.63-$2.82, requiring a willingness-to-pay of $9.00-$10.50 for >95% probability of cost-effectiveness. We find that the CIC-PDD model demonstrates cost-effectiveness within primary health care settings, but further studies are needed to assess its long-term sustainability and scalability. Trial registration: 35 ChiCTR2200065608.