Self- and surrogate-reported communication functioning in aphasia View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-06-24

AUTHORS

Patrick J. Doyle, William D. Hula, Shannon N. Austermann Hula, Clement A. Stone, Julie L. Wambaugh, Katherine B. Ross, James G. Schumacher

ABSTRACT

PurposeTo evaluate the dimensionality and measurement invariance of the aphasia communication outcome measure (ACOM), a self- and surrogate-reported measure of communicative functioning in aphasia.MethodsResponses to a large pool of items describing communication activities were collected from 133 community-dwelling persons with aphasia of ≥ 1 month post-onset and their associated surrogate respondents. These responses were evaluated using confirmatory and exploratory factor analysis. Chi-square difference tests of nested factor models were used to evaluate patient–surrogate measurement invariance and the equality of factor score means and variances. Association and agreement between self- and surrogate reports were examined using correlation and scatterplots of pairwise patient–surrogate differences.ResultsThree single-factor scales (Talking, Comprehension, and Writing) approximating patient–surrogate measurement invariance were identified. The variance of patient-reported scores on the Talking and Writing scales was higher than surrogate-reported variances on these scales. Correlations between self- and surrogate reports were moderate-to-strong, but there were significant disagreements in a substantial number of individual cases.ConclusionsDespite minimal bias and relatively strong association, surrogate reports of communicative functioning in aphasia are not reliable substitutes for self-reports by persons with aphasia. Furthermore, although measurement invariance is necessary for direct comparison of self- and surrogate reports, the costs of obtaining invariance in terms of scale reliability and content validity may be substantial. Development of non-invariant self- and surrogate report scales may be preferable for some applications. More... »

PAGES

957-967

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11136-012-0224-5

DOI

http://dx.doi.org/10.1007/s11136-012-0224-5

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1039535650

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/22729711


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