Department of Psychiatry, University of Leipzig, Germany
Correspondence: Steffi G. Riedel-Heller, Department of Psychiatry, University of Leipzig, Johannisallee 20, D-04317 Leipzig, Germany. Tel: +49-341-97 24 530; fax: +49-341-97 24 539; e-mail: ries{at}medizin.uni-leipzig.de
Declaration of interest Supported by Interdisziplinaeres Zentrum für Klinische Forschung (IZKF), University of Leipzig (01KS9504, project C7 79934700).
See part 2, pp.
255260, this issue.
Background The prevalence of dementia diagnosis according to ICD10 and DSMIIIR in population surveys remains poorly understood.
Aims To report and compare prevalence rates according to DSMIIIR and ICD10.
Method 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 DSMIIIR and ICD10 (SIDAM).
Results Whereas 17.4% (95% CI=15.9-19.5) of individuals aged 75+ years suffer from dementia according to DSMIIIR, only 12.4% (95% CI=10.6-14.2) are diagnosed as having dementia according to ICD10. The results revealed lower ICD10 rates in all investigated age groups. The largest differences appear in the oldest of the elderly.
Conclusions The ICD10 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.
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