Comparison of audio and audiovisual measures of adult stuttering: Implications for clinical trials

Sue Obrian, Mark Jones, Mark Onslow*, Ann Packman, Ross Menzies, Robyn Lowe

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

9 Citations (Scopus)


Purpose: This study investigated whether measures of percentage syllables stuttered (%SS) and stuttering severity ratings with a 9-point scale differ when made from audiovisual compared with audio-only recordings.

Method: Four experienced speech-language pathologists measured %SS and assigned stuttering severity ratings to 10-minute audiovisual and audio-only recordings of 36 adults.

Result: There was a mean 18% increase in %SS scores when samples were presented in audiovisual compared with audio-only mode. This result was consistent across both higher and lower %SS scores and was found to be directly attributable to counts of stuttered syllables rather than the total number of syllables. There was no significant difference between stuttering severity ratings made from the two modes.

Conclusion: In clinical trials research, when using %SS as the primary outcome measure, audiovisual samples would be preferred as long as clear, good quality, front-on images can be easily captured. Alternatively, stuttering severity ratings may be a more valid measure to use as they correlate well with %SS and values are not influenced by the presentation mode.

Original languageEnglish
Pages (from-to)589-593
Number of pages5
JournalInternational Journal of Speech-Language Pathology
Issue number6
Publication statusPublished - 2 Nov 2015
Externally publishedYes


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