Journal Article


Michael Gill
Brian Lawlor



neuroscience alzheimer s disease behavioural sub phenotypes confirmatory factor analysis cfa differential item functioning dif structural equation modelling neuropsychiatric inventory npi covariates multiple indicators multiple causes mimic model

A Multiple Indicators Multiple Causes (MIMIC) model of Behavioural and Psychological Symptoms in Dementia (BPSD). (2011)

Abstract Introduction Although there is evidence for distinct behavioural sub-phenotypes in Alzheimer's disease (AD), their inter-relationships and the effect of clinical variables on their expression have been little investigated. Methods We have analysed a sample of 1850 probable AD patients from the UK and Greece with 10 item Neuropsychiatric Inventory (NPI) data. We applied a Multiple Indicators Multiple Causes (MIMIC) approach to investigate the effect of MMSE, disease duration, gender, age and age of onset on the structure of a four-factor model consisting of ?psychosis?, ?moods?, ?agitation? and ?behavioural dyscontrol?. Results Specific clinical variables predicted the expression of individual factors. When the inter-relationship of factors is modelled, some previously significant associations are lost. For example, lower MMSE scores predict psychosis, agitation and behavioural dyscontrol factors, but psychosis and mood predict the agitation factor. Taking these associations into account MMSE scores did not predict agitation. Conclusions The complexity of the inter-relations between symptoms, factors and clinical variables is efficiently captured by this MIMIC model.
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Full list of authors on original publication

Michael Gill, Brian Lawlor

Experts in our system

Michael Gill
Trinity College Dublin
Total Publications: 294
Brian A. Lawlor
National College Ireland
Total Publications: 125