title: Midlife Neuroticism and the age of onset of Alzheimer's disease.
abstract: BACKGROUND
  There may be important public health implications of increasing our knowledge of factors associated with age of dementia onset. The pre-morbid personality domain of Neuroticism constituted an interesting and theoretically plausible, yet uninvestigated, candidate for such an association. We aimed to examine whether midlife Neuroticism was associated with earlier age of onset of Alzheimer's disease (AD).
  
  
  METHODS
  This was a case-comparison study of 213 patients with probable AD. Detailed clinical information was collected for all patients including age of onset of dementia symptoms. One or two knowledgeable informants rated each patient's midlife personality retrospectively using the Neuroticism, Extraversion, Openness Five-Factor Inventory (NEO-FFI) questionnaire. The relationship between midlife Neuroticism and age of dementia onset was evaluated using both correlational analysis and backward linear regression analysis.
  
  
  RESULTS
  Midlife Neuroticism predicted younger age of dementia onset in females but not in males. The association found in females was independent of pre-morbid history of affective disorder.
  
  
  CONCLUSIONS
  This finding and its potential mechanism warrant further investigation.
authors.affiliation: Medical Research Council (MRC) Centre for Neurodegeneration Research, Institute of Psychiatry, King's College London, UK. Nicola.Archer@iop.kcl.ac.uk
authors.forename: N
authors.initials: N
authors.lastname: Archer
authors.forename: R G
authors.initials: RG
authors.lastname: Brown
authors.forename: S
authors.initials: S
authors.lastname: Reeves
authors.forename: H
authors.initials: H
authors.lastname: Nicholas
authors.forename: H
authors.initials: H
authors.lastname: Boothby
authors.forename: S
authors.initials: S
authors.lastname: Lovestone
mesh_terms: D017668:Age of Onset; D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009497:Neurotic Disorders / Q000175:diagnosis* / Q000453:epidemiology / Q000523:psychology; D010552:Personality Assessment; D012307:Risk Factors; D012737:Sex Factors; D013223:Statistics as Topic