Non-pharmacological interventions linked to modest gains in dementia-related agitation and mood

NPIs were associated with small but statistically consistent reductions in agitation (standardized mean difference [SMD] −0.25, 95% CI: −0.36 to −0.13), depression (SMD −0.20, 95% CI: −0.29 to −0.11), and anxiety (SMD −0.21, 95% CI: −0.34 to −0.09). A modest improvement was observed in cognitive function (SMD 0.22, 95% CI: 0.11 to 0.34), whereas no significant effect was detected for quality of life (SMD 0.08, 95% CI: −0.15 to 0.32). The most consistent benefits were reported for information and communication technology-based interventions, massage and touch therapies, and physical exercise. Evidence certainty was rated moderate for agitation, depression, and anxiety, but low or very low for cognitive function and quality of life, reflecting variations in review methodological quality and limited evidence for some outcomes.

The umbrella review found effect sizes were consistently small across mood and behavior domains: agitation reduction of 0.25 standard units, depression and anxiety each around 0.20 units. Notably, cognitive function showed a slightly larger numeric benefit (0.22 units) but with low evidence certainty, suggesting measurement variability or publication bias in the underlying trials. Physical exercise, digital interventions, and tactile therapies demonstrated the most robust evidence across reviews. All 12 included reviews had at least one methodological weakness, and the very low evidence overlap (CCA 1.8%) indicates minimal duplication of patient populations, strengthening confidence in the direction of effects even if individual effect sizes are modest. The null finding for quality of life is striking—despite symptom improvements, global well-being outcomes remained unchanged, suggesting that behavioral gains may not translate to patient-perceived life satisfaction without additional psychosocial support.