Long-term clinical and cost-effectiveness of collaborative care in people with uncontrolled type 2 diabetes mellitus and polypharmacy: A multicenter randomized controlled trial.

Aims: This study examined the effectiveness of a collaborative care model on clinical and humanistic outcomes, medical cost, productivity loss, and its cost-effectiveness in managing uncontrolled Type 2 Diabetes Mellitus (T2DM).

Methods: A randomized controlled study was conducted in two outpatient health institutions in Singapore. Patients aged above 21 years with HbA1c > 7% and polypharmacy were included. Eligible patients were randomized into the intervention (collaborative care) and control (usual care) arms.

Results: A total of 255 patients were included in the analysis. Compared to the control arm, the intervention arm achieved significantly greater glycated hemoglobin (HbA1c) reduction (mean difference: 0.25, 95%CI: [0.001, 0.50], p = 0.049) and quality-adjusted life year (QALY) (+0.011, 95%CI: [0.003, 0.019], p = 0.011) at 12 months. The costs per additional HbA1c and QALY improvements over one year were $40.52 and $920.91 respectively. Activity impairment was lower in the intervention group both at 6 months (12.7% vs 19.0%; p = 0.022) and at 12 months (6.7% vs 14.0%; p = 0.008).

Conclusions: The collaborative care model achieved earlier HbA1c reduction and reduced patients' activity impairment without decreasing work productivity or increasing medical costs. This intervention is cost-effective for improving glycemic control and quality of life in patients with T2DM.