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Psychol Med. 1994 Feb;24(1):145-53.

A short form of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): development and cross-validation.

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  • 1NH&MRC Social Psychiatry Research Unit, Australian National University, Canberra.

Erratum in

  • Psychol Med 1995 Mar;25(2):437.


Data from four studies were used to assess the psychometric properties of the 26 IQCODE items. The items were assessed in terms of item-total correlations, test-retest reliabilities, correlations with indicators of current cognitive functioning and correlations with indicators of premorbid cognitive functioning. These data were used to develop a 16-item short form. The short form was cross-validated in a new sample using dementia/delirium diagnosis as the validity standard. It was found to perform as well as the long form.

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