The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review
Background and aims: The IQCODE is widely used as a screening test for dementia, particularly where the subject is unable to undergo direct cognitive testing or for screening in populations with low levels of education and literacy. This review draws together research on the psychometric properties...
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| Veröffentlicht in: | International psychogeriatrics 2004-09, Vol.16 (3), p.275-293 |
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| description | Background and aims: The IQCODE is widely used as a screening test for dementia, particularly where the subject is unable to undergo direct cognitive testing or for screening in populations with low levels of education and literacy. This review draws together research on the psychometric properties and validity of the IQCODE. Method: A systematic search of the literature was carried out using three databases. Results: The review shows that the questionnaire has high reliability and measures a single general factor of cognitive decline. It validly reflects past cognitive decline, performs at least as well at screening as conventional cognitive screening tests, predicts incident dementia, and correlates with a wide range of cognitive tests. A particular strength is that the IQCODE is relatively unaffected by education and pre-morbid ability or by proficiency in the culture's dominant language. The disadvantage of the IQCODE is that it is affected by informant characteristics such as depression and anxiety in the informant and the quality of the relationship between the informant and the subject. Conclusions: Because the IQCODE provides information complementary to brief cognitive tests, harnessing them together can improve screening accuracy. |
| doi_str_mv | 10.1017/S1041610204000390 |
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This review draws together research on the psychometric properties and validity of the IQCODE. Method: A systematic search of the literature was carried out using three databases. Results: The review shows that the questionnaire has high reliability and measures a single general factor of cognitive decline. It validly reflects past cognitive decline, performs at least as well at screening as conventional cognitive screening tests, predicts incident dementia, and correlates with a wide range of cognitive tests. A particular strength is that the IQCODE is relatively unaffected by education and pre-morbid ability or by proficiency in the culture's dominant language. The disadvantage of the IQCODE is that it is affected by informant characteristics such as depression and anxiety in the informant and the quality of the relationship between the informant and the subject. Conclusions: Because the IQCODE provides information complementary to brief cognitive tests, harnessing them together can improve screening accuracy.</description><identifier>ISSN: 1041-6102</identifier><identifier>EISSN: 1741-203X</identifier><identifier>DOI: 10.1017/S1041610204000390</identifier><identifier>PMID: 15559753</identifier><language>eng</language><publisher>Cambridge, UK: Cambridge University Press</publisher><subject>Aged ; Biological and medical sciences ; Cognition Disorders - diagnosis ; cognitive decline ; Dementia ; Dementia - diagnosis ; Humans ; informant ; Mass Screening - methods ; Medical sciences ; Neuropsychological Tests ; Older people ; Psychology. Psychoanalysis. Psychiatry ; Psychometrics. Diagnostic aid systems ; Psychopathology. 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Psychogeriatr</addtitle><description>Background and aims: The IQCODE is widely used as a screening test for dementia, particularly where the subject is unable to undergo direct cognitive testing or for screening in populations with low levels of education and literacy. This review draws together research on the psychometric properties and validity of the IQCODE. Method: A systematic search of the literature was carried out using three databases. Results: The review shows that the questionnaire has high reliability and measures a single general factor of cognitive decline. It validly reflects past cognitive decline, performs at least as well at screening as conventional cognitive screening tests, predicts incident dementia, and correlates with a wide range of cognitive tests. A particular strength is that the IQCODE is relatively unaffected by education and pre-morbid ability or by proficiency in the culture's dominant language. 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Psychoanalysis. Psychiatry</topic><topic>Psychometrics. Diagnostic aid systems</topic><topic>Psychopathology. Psychiatry</topic><topic>Reproducibility of Results</topic><topic>screening</topic><topic>Surveys and Questionnaires</topic><topic>Techniques and methods</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Jorm, Anthony F.</creatorcontrib><collection>ScienceDirect Open Access Titles</collection><collection>Elsevier:ScienceDirect:Open Access</collection><collection>Pascal-Francis</collection><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>ProQuest Social Sciences Premium Collection</collection><collection>ProQuest Central (Corporate)</collection><collection>Applied Social Sciences Index & Abstracts (ASSIA)</collection><collection>Nursing & Allied Health Database</collection><collection>Health & Medical Collection</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Medical Database (Alumni Edition)</collection><collection>Psychology Database (Alumni)</collection><collection>Social Science Database (Alumni Edition)</collection><collection>Hospital Premium Collection</collection><collection>Hospital Premium Collection (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>Social Science Premium Collection</collection><collection>British Nursing Database</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>Health Research Premium Collection</collection><collection>Health Research Premium Collection (Alumni)</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Sociology Collection</collection><collection>ProQuest Health & Medical Complete (Alumni)</collection><collection>Nursing & Allied Health Database (Alumni Edition)</collection><collection>Health & Medical Collection (Alumni Edition)</collection><collection>Medical Database</collection><collection>ProQuest Psychology</collection><collection>Research Library</collection><collection>Social Science Database</collection><collection>Sociology Database</collection><collection>Research Library (Corporate)</collection><collection>Nursing & Allied Health Premium</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest One Psychology</collection><collection>ProQuest Central Basic</collection><collection>MEDLINE - Academic</collection><jtitle>International psychogeriatrics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Jorm, Anthony F.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review</atitle><jtitle>International psychogeriatrics</jtitle><addtitle>Int. 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| subjects | Aged Biological and medical sciences Cognition Disorders - diagnosis cognitive decline Dementia Dementia - diagnosis Humans informant Mass Screening - methods Medical sciences Neuropsychological Tests Older people Psychology. Psychoanalysis. Psychiatry Psychometrics. Diagnostic aid systems Psychopathology. Psychiatry Reproducibility of Results screening Surveys and Questionnaires Techniques and methods |
| title | The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review |
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