The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review

@article{Jorm2004TheIQ,
  title={The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review},
  author={Anthony F Jorm},
  journal={International Psychogeriatrics},
  year={2004},
  volume={16},
  pages={275 - 293}
}
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… Expand
The Informant Questionnaire on cognitive decline in the elderly (IQCODE): a review.
TLDR
The IQCODE 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. Expand
The IQCODE: Using Informant Reports to Assess Cognitive Change in the Clinic and in Older Individuals Living in the Community
The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) uses the report of an informant to assess an individual’s change in cognition in the last 10 years. Unlike cognitive screeningExpand
Contribuição para a Validação do IQCODE - Informant Questionnaire on Cognitive Decline in the Elderly
The Informant Questionnaire on Cognitive Decline in the Elderly – IQCODE is an important screening tool in the diagnosis of dementia. Based on the informant’s report, is a brief interview whose mainExpand
[Informant report of cognitive changes in the elderly. A first evaluation of the German version of the IQCODE].
TLDR
The German version of the IQCODE reliably discriminates cognitively intact persons from those suffering from MCI or cortical dementia, but not between different types of cortex dementia, such as AD and FTLD. Expand
Modified Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) as a screening test for dementia for Thai elderly.
TLDR
The modified IQCODE could be used as an alternative screening test for dementia in Thailand with acceptable and specificity and may be useful for dementia screening in the community and the geriatric clinic for early detection of disease. Expand
Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) for the diagnosis of dementia within a secondary care setting.
TLDR
The diagnostic accuracy of the informant-based questionnaire IQCODE, for detection of all-cause (undifferentiated) dementia in adults presenting to secondary-care services was determined, with no significant differences in test accuracy between the general hospital setting and the specialist memory services. Expand
Sensitivity of the Informant Questionnaire on Cognitive Decline: An Application of Item Response Theory
  • Z. Butt
  • Psychology, Medicine
  • Neuropsychology, development, and cognition. Section B, Aging, neuropsychology and cognition
  • 2008
TLDR
Based on individuals' latent score estimates, items on the IQCODE are adequate for use as a screening tool for dementia and may be useful for targeted assessment needs, such as the development of short forms. Expand
Discriminant validity and reliability of the Turkish version of Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE-T).
TLDR
The validity and reliability of the Turkish version of IQCODE (IQCODE-T) was established and the ability of the questionnaire to distinguish between older adults with DSM-IV-TR dementia and healthy control participants was investigated. Expand
Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) for the diagnosis of dementia within community dwelling populations.
TLDR
This work sought to describe the accuracy of IQCODE (the index test) against a clinical diagnosis of dementia (the reference standard) and the effect of heterogeneity on the summary estimates. Expand
Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) for the early diagnosis of dementia across a variety of healthcare settings.
TLDR
To determine the diagnostic accuracy of IQCODE in a population free from dementia for the delayed diagnosis of dementia (test accuracy with delayed verification study design), a sensitive search strategy was developed, designed to cover key concepts using several different approaches run in parallel. Expand
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References

SHOWING 1-10 OF 58 REFERENCES
The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) as a screening tool for dementia for a predominantly illiterate chinese population
TLDR
The IQCODE can be shortened to 17 items, had good cross-cultural applicability, and was better than the MMSE-CE as a screening tool for dementia in a population with large variation in educational backgrounds. Expand
Further data on the validity of the informant questionnaire on cognitive decline in the elderly (IQCODE)
The validity of the long and short forms of the IQCODE was studied in a group of 144 elderly ex‐servicemen whose wives served as informants. The study examined the association of the IQCODE withExpand
The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms.
TLDR
A principal components analysis confirmed that the IQCODE measures a general factor of cognitive decline, and was found to discriminate well between the general population and dementing samples. Expand
Performance of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) as a screening test for dementia.
TLDR
A 26-item informant questionnaire (IQCODE) was found to perform at least as well as the MMSE against all diagnoses and significantly better when judged against the algorithmic ICD-10 diagnoses. Expand
The IQCODE: an alternative screening test for dementia for low educated Thai elderly.
TLDR
Informants' perceptions of cognitive impairment of the elderly can be reliably applied as a screening instrument for dementia in the Thai population with a variety of educational levels. Expand
The Screening of Mild Dementia with a Shortened Spanish Version of the “Informant Questionnaire on Cognitive Decline in the Elderly”
TLDR
The SS-IQCODE could be a useful screening test for the detection of mild dementia in the Spanish-speaking aged population, with greater diagnostic power and less contamination by independent variables than the MMSE. Expand
Improving screening accuracy for dementia in a community sample by augmenting cognitive testing with informant report.
TLDR
Combination of the IQCODE with the MMSE resulted in more accurate prediction of caseness than either test alone, and the appropriate combination of existing tests may be a fruitful method of improving screening accuracy in a variety of situations. Expand
Informant ratings of cognitive decline in old age: validation against change on cognitive tests over 7 to 8 years
TLDR
The IQCODE is a valid way of assessing cognitive decline when assessment can be carried out only at one point in time and correlated as highly with cognitive test change scores as these change scores correlated with each other. Expand
Validation of a French version of an informant-based questionnaire as a screening test for Alzheimer's disease.
  • S. Law, C. Wolfson
  • Psychology, Medicine
  • The British journal of psychiatry : the journal of mental science
  • 1995
TLDR
A French version of the IQCODE is validated as a screening test for Alzheimer's dementia in the elderly living in the community and is consistent with those of the English version in correlation with the MMSE and apparent freedom from educational bias. Expand
Assessment of cognitive impairment and dementia using informant reports
Abstract When assessing cognitive impairment and dementia, clinicians often seek information from informants to complement the findings from cognitive tests. In recent years, a number of standardizedExpand
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