Final Year Speech and Language Therapy Students’ Ratings of the GRBAS Perceptual Voice Assessment.
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Summary: Objectives. To investigate the intra-rater and inter-rater reliability of final year undergraduate speech and language therapy students scoring the GRBAS perceptual voice assessment on two separate occasions with a two week time interval. Study Design. Quantitative test-retest study. Methods. Six voices were twice evaluated by twenty-two final year undergraduate speech and language therapy students using the GRBAS perceptual voice assessment over two sessions with a time delay of two weeks. The individual parameters of the GRBAS scale (Grade, Roughness, Breathiness, Asthenia and Strain) were analysed using percentage agreement and Cohen’s kappa to find the intra-rater reliability of the participants’ scoring, and Fleiss’ kappa to find the inter-rater reliability of scoring agreement among the cohort. Results. Across the test and the re-test, the vocal parameter ‘Grade’ showed the best intra-rater reliability for participant agreement, and ‘Asthenia’ (vocal weakness) showed the lowest intra-rater agreement. ‘Roughness’ and ‘Grade’ showed the best inter-rater reliability among the cohort for both the initial test and the re-test two weeks later. The lowest inter-rater agreement among the cohort was ‘Asthenia’ in test one, and ‘Breathiness’ in test two. The results for intra-rater reliability ranged from a ‘moderate’ to a ‘minimal’ strength of agreement, and the results for inter-rater reliability ranged from a ‘weak’ to a ‘minimal’ strength of agreement. Conclusions. The participants have better reliability of internal agreement across two tests, than agreement among the participants’ scoring in the separate tests. The strength of agreement is very low both internally and between participants, so more training at a pre-registration level may be required in the less reliable parameters such as ‘Breathiness’ and ‘Asthenia’.
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