title: Prevalence of dementia according to DSM-III-R and ICD-10: results of the Leipzig Longitudinal Study of the Aged (LEILA75+) Part 1.
abstract: BACKGROUND
  The prevalence of dementia diagnosis according to ICD-10 and DSM-III-R in population surveys remains poorly understood.
  
  
  OBJECTIVE
  To report and compare prevalence rates according to DSM-III-R and ICD-10.
  
  
  METHODS
  A population-based sample (n=1692, age 75+years) was investigated by a Structured Interview for Diagnosis of Dementia of Alzheimer Type, Multiinfarct Dementia and Dementia of other Aetiology according to DSM-III-R and ICD-10 (SIDAM).
  
  
  RESULTS
  Whereas 17.4% (95% CI=15.9-19.5) of individuals aged 75+ years suffer from dementia according to DSM-III-R, only 12.4% (95% CI=10.6-14.2) are diagnosed as having dementia according to ICD-10. The results revealed lower ICD-10 rates in all investigated age groups. The largest differences appear in the oldest of the elderly.
  
  
  CONCLUSIONS
  The ICD-10 sets a higher threshold for dementia diagnosis. Larger differences in the eldest age groups might reflect difficulties in applying case definitions, especially in those beyond 90 years old.
authors.affiliation: Department of Psychiatry, University of Leipzig, Germany.
authors.forename: S G
authors.initials: SG
authors.lastname: Riedel-Heller
authors.forename: A
authors.initials: A
authors.lastname: Busse
authors.forename: C
authors.initials: C
authors.lastname: Aurich
authors.forename: H
authors.initials: H
authors.lastname: Matschinger
authors.forename: M C
authors.initials: MC
authors.lastname: Angermeyer
mesh_terms: D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D003704:Dementia / Q000453:epidemiology*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D015995:Prevalence; D011569:Psychiatric Status Rating Scales; D017678:Sex Distribution