The use of acoustic parameters for the evaluation of voice therapy of dysphonic patients

Speyer, Renée, Wieneke, George H., and Dejonckere, Philippe H. (2004) The use of acoustic parameters for the evaluation of voice therapy of dysphonic patients. Acta Acustica united with Acustica , 90 (3). pp. 520-527.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only



This study describes the amount of intra-subject variability to be expected when using an objective, acoustic analysis to evaluate voice. It also considers how such variability affects the assessment of a therapy outcome. In total, 82 patients suffering from chronic dysphonia were asked to produce three sustained vowels /a:/ at a comfortable pitch and loudness level. Three recordings were made over a six-week period. For each sample, acoustic variables characterizing jitter, shimmer and harmonic-to-noise ratio were computed. Statistical analysis was then used to estimate the expected intra-subject variability per acoustic parameter.

The variability of perturbation parameters increases with the magnitude of the parameter. Therefore, the inaccuracy was characterized by a relative error (coefficient of variation). For the acoustic parameters, distinctive inaccuracies in series of consecutive sustained vowels were found: the coefficients of variation ranged from 14% to 33%. When an individual therapy is evaluated by acoustic perturbation measures, the ratio of the post-therapy to the pre-therapy value generally had to be below 0.7 to 0.5 to consider the improvement significant.

Item ID: 31025
Item Type: Article (Research - C1)
ISSN: 1861-9959
Date Deposited: 24 Feb 2014 23:12
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1103 Clinical Sciences > 110315 Otorhinolaryngology @ 100%
SEO Codes: 92 HEALTH > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920107 Hearing, Vision, Speech and Their Disorders @ 100%
Downloads: Total: 2
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page