Effectiveness of a multicomponent lifestyle intervention against cognitive decline and dementia in an at‐risk‐population in Germany – Preliminary results of the cluster‐randomized AgeWell.de‐trial

Abstract

AbstractBackgroundMounting evidence suggests that dementia can be prevented. Targeting several risk factors simultaneously constitutes a promising strategy for preserving cognitive function. The AgeWell.de‐study was a cluster‐randomized trial applying a multi‐domain intervention to preserve cognitive function in older adults at risk for dementia in Germany.MethodIndividuals with a Cardiovascular Risk Factors, Aging and Dementia (CAIDE) dementia risk score ≥ 9 points aged 60‐77 years were recruited. According to randomization of their general practitioner (GP) practice, patients received either a multi‐domain intervention (optimization of nutrition and medication, physical, social and cognitive activity, cardiovascular risk management, intervention in case of depressive symptoms and/or grief) or general health advice and GP treatment as usual over 24 months. Primary outcome was global cognitive performance, assessed using a composite score based on z‐scores of domain‐specific neuropsychological tests.ResultOf 1,030 participants at baseline (intervention/control: n = 487/543), n = 819 (intervention/control: n = 378/441) completed the follow‐up assessment. Intervention and control group did not differ regarding global cognitive performance (β = 0·010, 95% CI: ‐0·085; 0·105) at follow‐up. However, post‐hoc analyses revealed beneficial effects for social cognition (β = 0·132, 95% CI: 0·012; 0·252) and health‐related quality of life (β = 0·194, 95% CI: 0·065; 0·323). The intervention improved global cognitive performance (β = 0·221, 95% CI: 0·015; 0·428), social cognition (β = 0·259, 95% CI: 0·024; 0·494) and health‐related quality of life (β = 0·421; 95% CI: 0·114; 0·728) in participants with low education, and reduced depressive symptoms in highly educated participants (β = ‐0·431; 95% CI: ‐0·781; ‐0·082). Younger participants benefitted from the intervention regarding social cognition (β = 0·174, 95% CI: 0·010; 0·337) and health‐related quality of life (β = 0·405, 95% CI: 0·241; 0·570).ConclusionNo effect of the multi‐domain intervention on global cognitive performance was found for the overall sample. The intervention benefitted global cognitive functioning in individuals with low education and social cognition and health‐related quality of life across the sample. Further benefits regarding specific subgroups point towards the usefulness of tailored interventions.