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- Title
Self- and surrogate-reported communication functioning in aphasia.
- Authors
Doyle, Patrick; Hula, William; Austermann Hula, Shannon; Stone, Clement; Wambaugh, Julie; Ross, Katherine; Schumacher, James
- Abstract
Purpose: To evaluate the dimensionality and measurement invariance of the aphasia communication outcome measure (ACOM), a self- and surrogate-reported measure of communicative functioning in aphasia. Methods: Responses 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. Results: Three 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. Conclusions: Despite 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.
- Subjects
APHASIA; DIMENSION reduction (Statistics); COMMUNICATIVE action; FACTOR analysis; CHI-squared test; VARIANCES; HEALTH outcome assessment
- Publication
Quality of Life Research, 2013, Vol 22, Issue 5, p957
- ISSN
0962-9343
- Publication type
Article
- DOI
10.1007/s11136-012-0224-5