Skip to main content Accessibility help
×
Home
Hostname: page-component-5bf98f6d76-94zm5 Total loading time: 0.353 Render date: 2021-04-22T12:45:20.991Z Has data issue: true Feature Flags: { "shouldUseShareProductTool": true, "shouldUseHypothesis": true, "isUnsiloEnabled": true, "metricsAbstractViews": false, "figures": false, "newCiteModal": false, "newCitedByModal": true }

The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms

Published online by Cambridge University Press:  09 July 2009

A. F. Jorm
Affiliation:
NH & MRC Social Psychiatry Research Unit, The Australian National University, Canberra, Australia
P. A. Jacomb
Affiliation:
NH & MRC Social Psychiatry Research Unit, The Australian National University, Canberra, Australia

Synopsis

The IQCODE is a questionnaire which asks an informant about changes in an elderly person's everyday cognitive function. The questionnaire aims to assess cognitive decline independent of pre-morbid ability. In the present study, the IQCODE was administered to a sample of 613 informants from the general population. In addition, the questionnaire was administered to informants of 309 dementing subjects who had filled it out one year previously. A principal components analysis, using the general population sample, confirmed that the IQCODE measures a general factor of cognitive decline. The questionnaire was found to have high internal reliability in the general population sample (alpha = 0·95) and reasonably high test-retest reliability over one year in the dementing sample (r = 0·75). The total IQCODE score, as well as each of the 26-items, was found to discriminate well between the general population and dementing samples. The correlation with education was quite small (r = – 0·13), indicating that contamination by premorbid ability is not a problem.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1989

Access options

Get access to the full version of this content by using one of the access options below.

References

Bank, L. & Jarvik, L. F. (1978). A longitudinal study of aging human twins. In The Genetics of Aging (ed, Schneider, E. L.), pp. 303334. Plenum Press: New York.CrossRefGoogle Scholar
Barclay, L. L., Zemcov, A., Blass, J. P. & Sansone, J. (1985). Survival in Alzheimer's disease and vascular dementias. Neurology 35, 834840.CrossRefGoogle ScholarPubMed
Barona, A., Reynolds, C. R. & Chastain, R. (1984). A demographically based index of premorbid intelligence for the WAIS-R. Journal of Consulting and Clinical Psychology 52, 885887.CrossRefGoogle Scholar
Blessed, G., Tomlinson, B. E. & Roth, M. (1968). The association between quantitative measures of dementia and of senile change in the cerebral grey matter of elderly subjects. British Journal of Psychiatry 114, 797811.CrossRefGoogle ScholarPubMed
Diesfeldt, H. F. A., van Houte, L. R & Moerkens, R M. (1986). Duration of survival in senile dementia. Acta Psychiatrica Scandinavica 73, 366371.CrossRefGoogle ScholarPubMed
Folstein, M. F., Folstein, S. E. & McHugh, P. R. (1974). ‘Mini-Mental State’: a practical method for grading the cognitive state of patients for the clinician. Journal of Psychiatric Research 12, 179198.Google Scholar
Jensen, A. R. (1980). Bias in Mental Testing. Methuen: London.Google Scholar
Jorm, A. F & Korten, A. E. (1988). Assessment of cognitive decline in the elderly by informant interview. British Journal of Psychiatry 152, 209213.CrossRefGoogle ScholarPubMed
Jorm, A. F., Scott, R. & Jacomb, P. A. (1989). Assessment of cognitive decline in dementia by informant questionnaire. International Journal of Geriatric Psychiatry 4, 3539.CrossRefGoogle Scholar
Nelson, H. E. & O'Connell, A. (1978). Dementia: the estimation of premorbid intelligence levels using the New Adult Reading Test. Cortex 14, 234244.CrossRefGoogle ScholarPubMed
Reynolds, C. R. (1982). Methods for detecting construct and predictive bias. In Handbook of Methods for Detecting Test Bias (ed, Berk, R. A.), pp. 199227. Johns Hopkins University Press: Baltimore and London.Google Scholar
Roth, M., Tym, E., Mountjoy, C. Q., Huppert, F. A., Hendrie, H., Verma, S. & Goddard, R. (1986). CAMDEX: a standardized instrument for the diagnosis of mental disorder in the elderly with special reference to the early detection of dementia. British Journal of Psychiatry 149, 698709.CrossRefGoogle Scholar

Altmetric attention score

Full text views

Full text views reflects PDF downloads, PDFs sent to Google Drive, Dropbox and Kindle and HTML full text views.

Total number of HTML views: 0
Total number of PDF views: 396 *
View data table for this chart

* Views captured on Cambridge Core between September 2016 - 22nd April 2021. This data will be updated every 24 hours.

Send article to Kindle

To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms
Available formats
×

Send article to Dropbox

To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms
Available formats
×

Send article to Google Drive

To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms
Available formats
×
×

Reply to: Submit a response


Your details


Conflicting interests

Do you have any conflicting interests? *