The DOI matches its Crossref record; 3 of the 3 references it cites were found in a registry or an index.
The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms
Abstract
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.
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Cited by
Azevedo, F. A. C., Carvalho, L. R. B., Grinberg, L. T., Farfel, J. M., Ferretti, R. E. L., Leite, R. E. P., Filho, W. J., Lent, R., & Herculano‐Houzel, S. (2009) · Journal of Comparative Neurology · doi:10.1002/cne.21974 · Cited by 2,337
Kalaria, R. N., Maestre, G. E., Arizaga, R., Friedland, R. P., Galasko, D., Hall, K., Luchsinger, J. A., Ogunniyi, A., Perry, E. K., Potocnik, F., et al. (2008) · The Lancet Neurology · doi:10.1016/s1474-4422(08)70169-8 · Cited by 1,233
Yaffe, K., Laffan, A. M., Harrison, S. L., Redline, S., Spira, A. P., Ensrud, K. E., Ancoli-Israel, S., & Stone, K. L. (2011) · JAMA · doi:10.1001/jama.2011.1115 · Cited by 1,137
Documented head injury in early adulthood and risk of Alzheimer’s disease and other dementias
Plassman, B. L., Havlik, R. J., Steffens, D. C., Helms, M. J., Newman, T. N., Drosdick, D., Phillips, C., Gau, B. A., Welsh–Bohmer, K. A., Burke, J. R., et al. (2000) · Neurology · doi:10.1212/wnl.55.8.1158 · Cited by 896
The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): a review
Jorm, A. F. (2004) · International Psychogeriatrics · doi:10.1017/s1041610204000390 · Cited by 823
“A systematic search of the literature was made using the following methods: (1) PubMed and PsycInfo were searched up to June 2003, using the search term IQCODE OR “informant questionnaire on cognitive decline in the elderly” (2) Web of Science was searched up to June 2003 for papers which cited two key references on t…”
BackgroundMethodSelf-citation
Metadata
- Authors
- Jorm, A. F., & Jacomb, P. A.
- Venue
- Psychological Medicine
- Publisher
- Cambridge University Press (CUP)
- Published
- 1989-11
- Volume
- 19
- Issue
- 4
- Pages
- 1015-1022
- ISSN
- 0033-2917 (ISSN-L)
- 1469-8978
- OpenAlex
- W2096529213
- Cited by
- 1,114
- References
- 3
- FWCI
- 2.72
- Type
- journal article
- Language
- en
- Open access
- closed
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- Jorm, A. F., & Jacomb, P. A. (1989). The Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE): socio-demographic correlates, reliability, validity and some norms. Psychological Medicine. https://doi.org/10.1017/s0033291700005742
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