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Journal of Speech, Language, and Hearing Research Vol.43 796-809 June 2000.
© American Speech-Language-Hearing Association
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The Dysphonia Severity Index

An Objective Measure of Vocal Quality Based on a Multiparameter Approach

Floris L. Wuyts 1
Marc S. De Bodt 1
Geert Molenberghs 2
Marc Remacle 3
Louis Heylen 1
Benoite Millet 4
Kristiane Van Lierde 5
Jan Raes 6

Paul H. Van de Heyning 1
1 University of Antwerp Antwerp, Belgium
2 Limburgs Universitair Centrum Diepenbeek, Belgium
3 University of Louvain Yvoir, Belgium
4 Brussels, Belgium
5 University of Gent Gent, Belgium
6 University of Brussels Jette, Belgium

wuyts{at}uia.ua.ac.be

The vocal quality of a patient is modeled by means of a Dysphonia Severity Index (DSI), which is designed to establish an objective and quantitative correlate of the perceived vocal quality. The DSI is based on the weighted combination of the following selected set of voice measurements: highest frequency (F0-High in Hz), lowest intensity (I-Low in dB), maximum phonation time (MPT in s), and jitter (%). The DSI is derived from a multivariate analysis of 387 subjects with the goal of describing, purely based on objective measures, the perceived voice quality. It is constructed as DSI=0.13 x MPT + 0.0053 x F0-High – 0.26 x I-Low – 1.18 x Jitter (%) + 12.4. The DSI for perceptually normal voices equals +5 and for severely dysphonic voices –5. The more negative the patient's index, the worse is his or her vocal quality. As such, the DSI is especially useful to evaluate therapeutic evolution of dysphonic patients. Additionally, there is a high correlation between the DSI and the Voice Handicap Index score.

KEY WORDS: voice quality, voice assessment, acoustic, voice range profile, index

Submitted on May 13, 1999
Accepted on November 22, 1999


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S. Simberg, P. Santtila, A. Soveri, M. Varjonen, E. Sala, and N. K. Sandnabba
Exploring Genetic and Environmental Effects in Dysphonia: A Twin Study
J Speech Lang Hear Res, February 1, 2009; 52(1): 153 - 163.
[Abstract] [Full Text] [PDF]


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