Encyclopedia of Clinical Neuropsychology

2018 Edition
| Editors: Jeffrey S. Kreutzer, John DeLuca, Bruce Caplan

Informant Questionnaire on Cognitive Decline in the Elderly

  • Jessica FishEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-57111-9_1813


IQCODE; Retrospective IQCODE; Short IQCODE


The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) aims to assess cognitive decline in elderly participants. It is an informant-rated questionnaire, with respondents rating items such as “remembering things that have happened recently” and “making decisions on everyday matters,” as to whether the subject has improved or declined over the last 10 years, using a five-point scale (“much improved,” “a bit improved,” “not much change,” “a bit worse,” or “much worse”). For this reason, the informant must have known the subject throughout the designated time period. The original version contained 26 items, but subsequently a 16-item short form was developed. The measure has been translated into many languages, including Chinese, Danish, Finnish, Persian, and Thai (short form only); French, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, and Spanish (long form only); and Dutch, German, and Persian...

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References and Readings

  1. Cherbuin, N., Anstey, K. J., & Lipnicki, D. M. (2008). Screening for dementia: A review of self- and informant-assessed instruments. International Psychogeriatrics, 20, 431–458.PubMedGoogle Scholar
  2. Hancock, P., & Larner, A. J. (2009). Diagnostic utility of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) and its combination with the Addenbrooke’s Cognitive Examination-Revised (ACE-R) in a memory clinic-based population. International Psychogeriatrics, 21, 526–530.PubMedCrossRefGoogle Scholar
  3. Harrison, J. K., Stott, D. J., McShane, R., Noel-Storr, A. H., Swann-Price, R. S., & Quinn, T. J. (2016). Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) for the early diagnosis of dementia across a variety of healthcare settings. Cochrane Database of Systematic Reviews, 11, CD011333.PubMedGoogle Scholar
  4. Isella, V., Villa, L., Russo, A., Regazzoni, R., Ferrarese, C., & Appollonio, I. M. (2006). Discriminative and predictive power of an informant report in mild cognitive impairment. Journal of Neurology, Neurosurgery and Psychiatry, 77, 166–171.PubMedCrossRefGoogle Scholar
  5. Jorm, A. F. (2004). The informant questionnaire on cognitive decline in the elderly (IQCODE): A review. International Psychogeriatrics, 16, 1–19.CrossRefGoogle Scholar
  6. Substantial information regarding the IQCODE, including long, short and retrospective forms of the measure, in several languages, can be downloaded from the following website: http://crahw.anu.edu.au/risk-assessment-tools/informant-questionnaire-cognitive-decline-elderly. Accessed 25 Feb 2017.

Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Medical Research Council Cognition and Brain Sciences UnitCambridgeUK