Psychological Medicine

Original Articles

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

A. F. Jorma1 c1, R. Scotta1, J. S. Cullena1 and A. J. MacKinnona1

a1 NH & MRC Social Psychiatry Research Unit, The Australian National University, Canberra, Australia

Abstract

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.

Correspondence:

c1 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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