ArticleJournal of speech, language, and hearing research : JSLHR2026
Dissociable Effects of Dysarthria Etiology and Severity on the Minimally Detectable Change of Speech Intelligibility.
Article in Journal of speech, language, and hearing research : JSLHR, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
purposeThe minimally detectable change (MDC) provides a threshold for interpreting changes in outcome measures that are outside of measurement error. There is emerging evidence that dysarthria etiology and speech severity impact the MDC of speech intelligibility; however, an investigation of these factors is needed to determine the unique effects of dysarthria etiology and speech severity. The purpose of the current study was to calculate and compare MDCs of speech intelligibility across five dysarthria etiology groups and four severity levels.
methodSpeech Intelligibility Test recordings from 200 speakers were used as stimuli, including recordings from healthy controls (
resultsSpeech severity was a significant predictor of MDCs, with greater impairments to speech intelligibility resulting in higher MDCs. Dysarthria etiology was not a significant predictor of MDCs.
conclusionThe impact of speech severity on MDCs of intelligibility in dysarthria underscores the need to calculate and provide MDCs across severity ranges to enhance the interpretation of patient outcomes.
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