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Performance of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) as a screening test for dementia

  • A. F. Jorm (a1), R. Scott (a1), J. S. Cullen (a1) and A. J. MacKinnon (a1)

A 26-item informant questionnaire (IQCODE) and the Mini-Mental State Examination (MMSE) were compared as screening tests for dementia in a sample of 69 patients. Dementia diagnoses were made by both a clinician and a research interview using a computer algorithm to meet DSM-III-R and ICD-10 (Draft) criteria. The IQCODE was found to perform at least as well as the MMSE against all diagnoses and significantly better when judged against the algorithmic ICD-10 diagnoses. Also, the IQCODE was found to be uncontaminated by pre-morbid ability as estimated from the National Adult Reading Test and to have very high test–retest reliability after a delay of a day or more.

Corresponding author
1 Address for correspondence: Dr A. F. Jorm, NH & MRC Social Psychiatry Research Unit, The Australian National University, GPO Box 4, Canberra, ACT 2601, Australia.
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American Psychiatric Association (1987). Diagnostic and Statistical Manual of Mental Disorders (3rd ed revised). American Psychiatric Association: Washington DC.
Folstein M. F., Folstein S. E. & McHugh P. R. (1975). ‘Mini-Mental State’: a practical method for grading the cognitive state of patients for the clinician. Journal of Psychiatric Research, 12, 189198.
Hanley J. A. & McNeil B. J. (1982). The meaning and use of the area under a receiver operating characteristic (ROC) curve. Radiology 143, 2936.
Hanley J. A. & McNeil B. J. (1983). A method of comparing the areas under receiver operating characteristic curves derived from the same cases. Radiology 148, 839843.
Jorm A. F. & Jacomb P. A. (1989). The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms. Psychological Medicine 19, 10151022.
Murphy J. M., Berwick D. M., Weinstein M. C., Borus J. F., Budman S. H. & Klerman G. L. (1987). Performance of screening and diagnostic tests. Application of receiver operating characteristic analysis. Archives of General Psychiatry 44, 550555.
Nelson H. E. (1982). National Adult Reading Test (NART). NFER-Nelson: Windsor.
World Health Organization (1990). ICD-10 Draft of Chapter V: Categories F00–F99, Mental and Behavioural Disorders (including Disorders of Psychological Development). Diagnostic Criteria for Research. (WHO/MNH/MEP/87.1, Rev 4). World Health Organization, Division of Mental Health: Geneva.
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Psychological Medicine
  • ISSN: 0033-2917
  • EISSN: 1469-8978
  • URL: /core/journals/psychological-medicine
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