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Performance of Brazilian long and short IQCODE on the screening of dementia in elderly people with low education

Published online by Cambridge University Press:  27 March 2009

Tíbor Rilho Perroco ,
Sonia E. Zevallos Bustamante ,
María del Pilar Q. Moreno ,
Sérgio R. Hototian ,
Marcos A. Lopes ,
Dionísio Azevedo ,
Júlio Litvoc ,
Wilson Jacob Filho  and
Cássio M. C. Bottino
Tíbor Rilho Perroco*
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Sonia E. Zevallos Bustamante
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
María del Pilar Q. Moreno
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Sérgio R. Hototian
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Marcos A. Lopes
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Dionísio Azevedo
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Júlio Litvoc
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Wilson Jacob Filho
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
Cássio M. C. Bottino
Affiliation:
Old Age Research Group (PROTER), Institute and Department of Psychiatry, Faculty of Medicine, University of São Paulo, Brazil
*
Correspondence should be addressed to: Dr. Tíbor R. Perroco, Old Age Research Group (PROTER), Institute of Psychiatry, Faculty of Medicine, University of São Paulo, R. Dr. Ovídio Pires de Campos, 785, 3° andar, CEAPESQ, sala 14, São Paulo / SP. CEP: 05403–010, Brazil. Phone: +55 11 306 969 73; Fax: +55 11 306 980 18. Email: [email protected] and [email protected].
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Abstract

Background: Dementia screening in elderly people with low education can be difficult to implement. For these subjects, informant reports using the long (L) (26 items) and short (C) (16 items) versions of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) can be useful. The objective of the present study was to investigate the performance of Brazilian versions of the IQCODE L, S and a new short version (SBr) (15 items) in comparison with the Mini-mental State Examination (MMSE) for dementia screening in elderly people with low education.

Methods: Thirty-four patients with mild to moderate dementia, diagnosed according to ICD-10 criteria, and 57 controls were evaluated and divided into three groups based on their socioeconomic status and level of education. Patients were evaluated using the MMSE and the informants were interviewed using the IQCODE by interviewers blind to the clinical diagnosis.

Results: Education was correlated with MMSE results (r = 0.280, p = 0.031), but not with the versions of the IQCODE. The performance of the instruments, evaluated by the ROC curves, was very similar, with good internal consistency (Cronbach's α = 0.97). MMSE correctly classified 85.7% of the subjects while the three IQCODE versions (L, S and SBr) correctly classified 91.2% of the subjects.

Conclusions: The long, short and the new short Brazilian IQCODE versions can be useful as a screening tool for mild and moderate patients with dementia in Brazil. The IQCODE is not biased by schooling, and it seems to be an adequate instrument for samples with low levels of education.

Keywords

dementiascreening testsinformant reportdiagnosis
Type
Research Article
Information
International Psychogeriatrics , Volume 21 , Issue 3 , June 2009 , pp. 531 - 538
Copyright
Copyright © International Psychogeriatric Association 2009

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