Validity and reliability of the Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) for dementia assessment in rural South Africa
Sixteen-item Informant Questionnaire on Cognitive Decline in the Elderly (IQCODE) responses in rural South Africa support a single-factor construct, explaining up to 66% of total observed variance. The single-factor structure is reliable, as the IQCODE items data show high internal consistency (omega hierarchical = 0.90). The IQCODE score shows strong convergent validity with significant correlation with word and story recall memory measures. Index participants' characteristics are mainly associated with IQCODE completion. IQCODE contributes to dementia assessment in rural South Africa and other settings with low education populations.
Authors
- Adam M. Brickman (ORCID: https://orcid.org/0000-0002-5125-8226)
- Brent Tipping
- Tâmara P. Taporoski (ORCID: https://orcid.org/0000-0001-8783-4013)
- Nomsa Mahlalela (ORCID: https://orcid.org/0000-0001-6185-1122)
- Darina T. Bassil (ORCID: https://orcid.org/0000-0002-2251-0613)
- Muqi Guo (ORCID: https://orcid.org/0000-0001-7081-5158)
- Jennifer J. Manly (ORCID: https://orcid.org/0000-0002-9481-7497)
- Meagan T. Farrell (ORCID: https://orcid.org/0000-0002-4507-4017)
- Lisa Berkman
Institutions
- Harvard University (US)
- University of the Witwatersrand (ZA)
- University of Michigan (US)
- Harvard University Press (US)
- Agincourt Health and Socio-Demographic Surveillance System (ZA)
- Wits University Donald Gordon Medical Centre (ZA)
- Columbia University (US)
Publication Details
- Journal
- Alzheimer s & Dementia
- Published
- 2025-08-01
- DOI
- https://doi.org/10.1002/alz.70584
- Primary Topic
- Dementia and Cognitive Impairment Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- South African Medical Research Council
- University of the Witwatersrand, Johannesburg
- National Institutes of Health
- Medical Research Council
- National Institute on Aging