Objectives: To assess the cost-effectiveness of the WISDOM self-management intervention for type 2 diabetes compared with care as usual.
Design:We performed a difference-in-differences analysis to estimate differences in risk factors for diabetes complications between people in the WISDOM group (n = 25, 276) and a control group (n = 15, 272) using GP records. A decision analytic model was then used to extrapolate differences in risk factors into costs and outcomes in the long term.Setting: Participating GP practices in West Hampshire and Southampton, UK.