Guimaraes, Isabel Christina Ramos Peixoto; (2002) An electrolaryngographic study of dysphonic Portuguese speakers. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

Fifty-two dysphonic Portuguese adult speakers were studied in a prospective exploratory study with fifty-seven healthy volunteers for control purposes. A standard complex evaluation protocol including: larynx examination; perceptual voice evaluation; subject's history questionnaire; self-rated level of stress and psychosocial voice impact; and electrolaryngographic measurement were consistently carried out. The specific aims of this study were (a) normative, to establish tentative normative data for Portuguese speakers; (b) comparative, to investigate whether statistically significant differences exist between two groups with different voice conditions, on performance of different speech tasks and self-rating voice impact; and (c) predictive, to test for the physical variables that best predict aspects of the voice data (fundamental frequency (F0) and contact closed quotient derived measures) and the subjects' self-rated psychosocial voice impact data. This study concentrates on the electrolaryngographic measurement and subjects' self-ratings psychosocial voice impact. From sustained vowel phonation, reading and conversation several fundamental frequency measures (mean, standard deviation, range and perturbation) and contact derived measures (closed contact quotient mean and standard deviation) were extracted. Also from the psychosocial voice questionnaire measures such as emotional, functional and physical impact were derived. Inferential and regression analyses were applied to these measures. The normative data proved to be a valuable reference and within the limitations of the study, the following conclusions may be drawn: (1) ANOVA data analysis showed that dysphonia has a significant effect (a) on speech for the F0 standard deviation and for the percentage of F0 irregularity; (b) there is an interaction with age for the 90% F0 range; (c) dysphonia has a main effect on the psychosocial voice impact; (2) when a multivariate analysis was used, evidence suggest that the models (combining predictor variables) contribute differentially between high prediction of the mean F0 variance and moderate to low prediction of the other voice measures.

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