A Review of Dementia Caregiver Interventions: Valuing Psychological Well-Being and Economic Impact Through the State-Preference Method

OBJECTIVES: To integrate clinical and economic evidence on the main non-pharmacological interventions aimed to reduce the burden of caregivers of people with dementia, with specific attention to stated preference measures (SPM), Willingness-to-Pay (WTP) and Willingness-to-Accept (WTA), alongside other cost-effectiveness indicators (ICER, QALY). METHODS: A systematic review was conducted on randomized and quasi-experimental evaluations, economic models, and preference studies concerning psychoeducational/coping interventions, activity-centered/occupational programs (TAP), technological solutions and tele-support, and goal-oriented cognitive rehabilitation (CR). For each study, the following indexes were extracted: design, sample size, psychological outcomes (anxiety/depression, burden, engagement), utility per QALY, costs per perspective (the health-social and the broader societal perspectives), ICER, WTP/WTA, and sensitivity results. RESULTS: Psychoeducational programs and CR show consistent benefits on distress, anxiety/depression, and caregiver quality of life; TAP reduces caregiver burden and patient behavioral problems, with favorable signs of cost-effectiveness; results on the effects of technologies are heterogeneous, but online modules with telephone support improve psychological morbidity. QALY improvement is generally modest, but the probability of cost-effectiveness remains high when costs do not differ significantly from treatment as usual, or when, from a societal perspective, the unpaid caregiving time of the caregiver is valued. Preference studies indicate positive WTP for additional hours of home care, health-social integration, and facilitated groups; evidence on WTA is scarcer and methodologically variable. CONCLUSIONS: Short, structured interventions with a human support component offer good value-for-money; the adoption of societal perspectives and the systematic use of WTP/WTA can better capture the value perceived by caregivers. Heterogeneity issues persist.