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    Beliefs About Dementia: Development and Validation of the Representations and Adjustment to Dementia Index (RADIX)

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    QuinnMorrisClare_RADIX_2018.pdf (158.1Kb)
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    Publication date
    2018-06
    Author
    Quinn, Catherine
    Morris, R.G.
    Clare, L.
    Keyword
    Alzheimer's disease
    Illness perception
    Illness representations
    Questionnaire
    Reliability
    Validity
    Rights
    (c) 2018 The Authors. This is an Open Access article distributed under the Creative Commons CC-BY license (http://creativecommons.org/licenses/by/4.0/)
    Peer-Reviewed
    Yes
    
    Metadata
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    Abstract
    The Self-Regulation Model (SRM) identifies that the beliefs people hold about an illness can influence their responses to that illness. Although there are generic measures of illness representations, there is a need for a brief tailored measure to use with people with dementia. The aim of this study was to develop and validate a brief measure called the Representations and Adjustment to Dementia Index (RADIX). The RADIX contains questions on the SRM elements: Identity, Cause, Timeline, Control, and Consequences. The RADIX validation was conducted with a sample of 385 community-dwelling people with mild to moderate dementia who were taking part in the IDEAL cohort study. Test-retest reliability was conducted over a 4-week period with a separate sample of 20 people with dementia. The validation process resulted in a reduction in the number of items in the Timeline, Control, and Consequences items. The resulting RADIX demonstrated good acceptability, internal reliability, and test-retest reliability. All the RADIX items had low missing data, indicating good acceptability. The factor analysis confirmed that the Consequences items formed two subscales (practical and emotional consequences) that had Cronbach's α of 8 and 0.91 respectively. Test-retest reliability indicated that the Identity, Timeline, and Control items had moderate reliability and the practical and emotional consequences scales had good reliability. The RADIX demonstrates acceptable psychometric properties, proves to be a useful measure for exploring people's beliefs about dementia, and could aid the provision of tailored information and support to people with dementia.
    URI
    http://hdl.handle.net/10454/16727
    Version
    Published version
    Citation
    Quinn C, Morris RG and Clare L (2018) Beliefs About Dementia: Development and Validation of the Representations and Adjustment to Dementia Index (RADIX). American Journal of Geriatric Psychiatry. 26(6): 680-689.
    Link to publisher’s version
    https://doi.org/10.1016/j.jagp.2018.02.004
    Type
    Article
    Collections
    Health Studies Publications

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