Simone Knuijt1, Johanna G Kalf1, Baziel G M van Engelen2, Bert J M de Swart1,3, Alexander C H Geurts1. 1. Department of Rehabilitation, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands. 2. Department of Neurology, Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, Nijmegen, the Netherlands. 3. HAN University of Applied Sciences, Institute of Health Studies, Nijmegen, the Netherlands.
Abstract
OBJECTIVE: In the absence of an adequate dysarthria assessment in the Netherlands, we developed the Radboud Dysarthria Assessment (RDA). This article describes its development and clinimetric evaluation. PATIENTS AND METHODS: Forty-three patients were assessed with the RDA. The recording forms were subjected to exploratory factor analysis and estimation of internal consistency. The self-evaluation questionnaire was tested for internal consistency and the severity scale for intra- and inter-rater reliability. Construct validity of the severity scale and questionnaire was determined by relating them to the Speech Handicap Index (SHI), Dutch sentence intelligibility assessment (NSVO-Z), and category fluency task. RESULTS: Exploratory factor analysis extracted 4 factors (articulation, resonance, phonation, respiration/prosody) yielding an explained variance of 70.3%. Each factor showed good internal consistency (Cronbach's α: 0.89-0.91). The self-evaluation questionnaire showed excellent internal consistency (Cronbach's α: 0.90). Intra-class correlation coefficients of the severity scale (0.85-0.86) showed good reliability. The severity scores and self-evaluation questionnaire correlated substantially to strongly with the SHI (rs = 0.40 and 0.80) and substantially with the NSVO-Z (rs = -0.65 and -0.52). CONCLUSIONS: The RDA is a valid and reliable tool, but further investigation is needed to demonstrate whether this instrument can successfully support speech-language therapists in correctly diagnosing the type of dysarthria.
OBJECTIVE: In the absence of an adequate dysarthria assessment in the Netherlands, we developed the Radboud Dysarthria Assessment (RDA). This article describes its development and clinimetric evaluation. PATIENTS AND METHODS: Forty-three patients were assessed with the RDA. The recording forms were subjected to exploratory factor analysis and estimation of internal consistency. The self-evaluation questionnaire was tested for internal consistency and the severity scale for intra- and inter-rater reliability. Construct validity of the severity scale and questionnaire was determined by relating them to the Speech Handicap Index (SHI), Dutch sentence intelligibility assessment (NSVO-Z), and category fluency task. RESULTS: Exploratory factor analysis extracted 4 factors (articulation, resonance, phonation, respiration/prosody) yielding an explained variance of 70.3%. Each factor showed good internal consistency (Cronbach's α: 0.89-0.91). The self-evaluation questionnaire showed excellent internal consistency (Cronbach's α: 0.90). Intra-class correlation coefficients of the severity scale (0.85-0.86) showed good reliability. The severity scores and self-evaluation questionnaire correlated substantially to strongly with the SHI (rs = 0.40 and 0.80) and substantially with the NSVO-Z (rs = -0.65 and -0.52). CONCLUSIONS: The RDA is a valid and reliable tool, but further investigation is needed to demonstrate whether this instrument can successfully support speech-language therapists in correctly diagnosing the type of dysarthria.
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Authors: Rosemarie H M J M Kroon; Corinne G C Horlings; Bert J M de Swart; Baziel G M van Engelen; Johanna G Kalf Journal: J Neuromuscul Dis Date: 2020
Authors: Rosemarie H M J M Kroon; Johanna G Kalf; Bert J M de Swart; Barbara M van der Sluijs; Jeffrey C Glennon; Vered Raz; Baziel G van Engelen; Corinne G C Horlings Journal: Neurology Date: 2021-08-11 Impact factor: 9.910