An Online Shared Decision-making Intervention for Dementia Prevention: A Parallel-group Randomized Pilot Study.

Objectives: Evaluate the acceptability and efficacy of an online dementia prevention intervention based on a cognitive behavioral shared decision-making model.

Materials and methods: This was an unblinded pilot study in which participants were randomly assigned to one of two treatment groups. This study was carried out remotely via telephone, video conferencing, and online data collection. Eighteen English-speaking persons 40 years of age and older interested in developing more brain-healthy lifestyles. Both groups received 12 weekly sessions on lifestyle factors related to cognitive decline. The treatment-as-usual (TAU) group received the information and was encouraged to make lifestyle changes. The cognitive behavioral shared decision- making model (CBSDM) group received structured weekly sessions with support for evidence- informed personal goal choices and behavior change strategies. Primary outcome measures were the Alzheimer's Disease Risk Inventory and the Memory Self-Efficacy and Dementia Knowledge Assessment Scales. Participants reported brain health activities during the first, sixth, and 12th weeks of the study.

Results: No significant between-group changes were seen in the three primary outcome measures. The intervention was viewed positively by participants, who all said they would participate in it again. Participants in the CBSDM group showed increases in knowledge of dementia risk factors and exercise. Other outcomes were consistent with moderate to large effect sizes for both groups.

Conclusion: An online intervention providing psychoeducation and behavior change support was viewed positively by older adults. Results provide preliminary support for the CBSDM intervention's efficacy in promoting brain health in older adults.

Clinical trial registration number: NCT04822129.