The relationship between pre-morbid personality and challenging behaviour in people with dementia: A systematic review

It has been suggested that challenging behaviour in people with dementia reflects a person's pre-morbid personality traits and a number of studies have explored this hypothesis. However, inconsistencies in outcome between studies suggest a need to review the available evidence systematically. As a result, major bibliographic databases were searched for studies examining the relationship between pre-morbid personality and challenging behaviour in order to conduct a systematic review. We included all English language studies published in referenced journals that assessed pre-morbid personality via a valid comprehensive personality measure, and also explored a relationship with challenging behaviour in people with dementia. A total of 18 studies were identified that covered a wide range of challenging behaviours including 'wandering', affective states, aggression, anxiety and delusions/hallucinations. Studies were assessed for their methodological quality and statistical findings. Studies lacked representative samples, were affected by confounding variables and suffered from small sample sizes. However, 72% of the studies reported significant relationships between pre-morbid personality and behaviour. In terms of specific relationships, the strongest evidence was found for a positive relationship between pre-morbid neuroticism and mood, and aggression and overall behavioural acts, thus supporting the inclusion of personality as one factor in the formulation of behaviour (Ballard, C., O'Brien, J., James, I., Swann, A. (2001). Dementia: Management of Behavioural and Psychological Symptoms. Oxford: Oxford University Press; Kitwood, T. (1993). Person and process in dementia: Editorial. International Journal of Geriatric Psychiatry, 1, 541-545).