Incidence of dementia according to DSM-III-R and ICD-10: results of the Leipzig Longitudinal Study of the Aged (LEILA75+), Part 2.
BACKGROUND
The impact of different case definitions on incidence rates remains unclear.


OBJECTIVE
To compare incidence rates of dementia according to DSM-III-R and ICD-10.


METHODS
A two-wave community study was conducted (n=1692, age 75+ years follow-up period 1.6 years). Cognitive function was assessed by the Structured Interview for Diagnosis of Dementia of Alzheimer Type, Multiinfarct Dementia and Dementia of other Aetiology according to ICD-10 and DSM-III-R (SIDAM).


RESULTS
The annual incidence rate for dementia by applying different case definitions was found to be quite similar (DSM-III-R: 47.4 (95% CI=36.1-61.2) per 1000 person-years; ICD-10: 45.8 (95% CI=35.0-59.0) per 1000 person-years). Age-specific incidence rates increase steeply with age.


CONCLUSIONS
The impact of different case definitions on incidence rates of dementia appears limited if case definitions and case-finding procedures at baseline and follow-up are applied consistently.
Riedel-Heller
S G
SG
Department of Psychiatry, University of Leipzig, Germany. ries@medizin.uni-leipzig.de
Busse
A
A
Aurich
C
C
Matschinger
H
H
Angermeyer
M C
MC
D017677:Age Distribution; D000368:Aged; D000369:Aged, 80 and over; D003704:Dementia / Q000175:diagnosis / Q000453:epidemiology*; D005260:Female; D005858:Germany / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D008137:Longitudinal Studies; D008297:Male; D011569:Psychiatric Status Rating Scales; D017678:Sex Distribution