Aggressive Behaviors in Alzheimer Disease and Mild Cognitive Impairment: Systematic Review and Meta-Analysis.

•This is the first quantitative synthesis estimating the risk of aggressive behaviors in dementia and mild cognitive impairment.•Individuals with Alzheimer's disease have five times higher odds of aggression than healthy controls.•We found no differences in risks of aggression between mild cognitive impairment and normal population controls and between dementias of differing aetiologies.