The Contributions of Phonatory Volume and Transglottal Airflow to the S/Z Ratio This investigation tested two underlying premises of the s/z ratio. Interpretation of the ratio rests on the assumptions of equal phonatory volumes in producing both consonants and of increased airflow for /z/ due to glottal lesions. This investigation measured both volume and airflow produced by 25 women and 7 men ... Research Article
Research Article  |   February 01, 1997
The Contributions of Phonatory Volume and Transglottal Airflow to the S/Z Ratio
 
Author Affiliations & Notes
  • Michael D. Trudeau
    The Ohio State University, Columbus
  • L. Arick Forrest
    The Ohio State University, Columbus
  • Contact author: Michael D. Trudeau, PhD, Department of Otolaryngology, 4A, University Hospitals Clinic, The Ohio State University, Columbus, OH 43210.
    Contact author: Michael D. Trudeau, PhD, Department of Otolaryngology, 4A, University Hospitals Clinic, The Ohio State University, Columbus, OH 43210.×
  • Corresponding author: Email: Trudeau.1@osu.edu.
Article Information
Research Articles
Research Article   |   February 01, 1997
The Contributions of Phonatory Volume and Transglottal Airflow to the S/Z Ratio
American Journal of Speech-Language Pathology, February 1997, Vol. 6, 65-69. doi:10.1044/1058-0360.0601.65
History: Received September 18, 1995 , Accepted June 27, 1996
 
American Journal of Speech-Language Pathology, February 1997, Vol. 6, 65-69. doi:10.1044/1058-0360.0601.65
History: Received September 18, 1995; Accepted June 27, 1996

This investigation tested two underlying premises of the s/z ratio. Interpretation of the ratio rests on the assumptions of equal phonatory volumes in producing both consonants and of increased airflow for /z/ due to glottal lesions. This investigation measured both volume and airflow produced by 25 women and 7 men with glottal lesions (nodules, polyps, and leukoplakia). ANOVA results indicated that equivalent volumes were used and that airflow was not significantly different for /s/ and /z/. This latter finding raises questions of the validity of the ratio’s use in screening the voice for glottal lesions.

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