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

Psychol Med. 1994 Feb;24(1):145-53. doi: 10.1017/s003329170002691x.


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.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged / psychology*
  • Cognition Disorders / diagnosis*
  • Cognition Disorders / etiology*
  • Dementia / complications*
  • Dementia / diagnosis
  • Employment
  • Geriatric Assessment
  • Humans
  • Memory Disorders / diagnosis
  • Memory Disorders / etiology
  • Psychiatric Status Rating Scales
  • Reproducibility of Results*
  • Surveys and Questionnaires*