Journal
TOPICS IN STROKE REHABILITATION
Volume 18, Issue 4, Pages 352-360Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1310/tsr1804-352
Keywords
aphasia; assessment; communication confidence; rating scale; Rasch analysis
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Funding
- National Institute on Disability and Rehabilitation Research, US Department of Education [H133B031127, H133G060055, H133G070074]
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Confidence is a construct that has not been explored previously in aphasia research. We developed the Communication Confidence Rating Scale for Aphasia (CCRSA) to assess confidence in communicating in a variety of activities and evaluated its psychometric properties using rating scale (Rasch) analysis. The CCRSA was administered to 21 individuals with aphasia before and after participation in a computer-based language therapy study. Person reliability of the 8-item CCRSA was .77. The 5-category rating scale demonstrated monotonic increases in average measures from low to high ratings. However, one item (I follow news, sports, stories on TV/movies) misfit the construct defined by the other items (mean square infit = 1.69, item-measure correlation = .41). Deleting this item improved reliability to .79; the 7 remaining items demonstrated excellent fit to the underlying construct, although there was a modest ceiling effect in this sample. Pre- to posttreatment changes on the 7-item CCRSA measure were statistically significant using a paired samples t test. Findings support the reliability and sensitivity of the CCRSA in assessing participants' self-report of communication confidence. Further evaluation of communication confidence is required with larger and more diverse samples.
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