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- An investigation of the voice handicap index with speakers of portuguese: preliminary dataPublication . Guimarães, Isabel; Abberton, EvelynAlthough the Voice Handicap Index (VHI) has been recognized as a useful tool for quantifying American English speakers’ perceived consequences of voice disorder, it has not yet been widely applied in the clinic to study dysphonic patient populations, or tested with a normally speaking population. The purpose of this investigation was to obtain information about the VHI in a group of Portuguese speakers with voice complaints compared with an age- and gender-matched group of speakers without voice complaints. The results demonstrate that speakers with voice complaints have overall VHI total scores significantly higher than speakers without voice complaints (p < 0.001). This is also true for allVHIsubscores in the emotional (p < 0.001), functional (p < 0.05), and physical (p < 0.001) domains. So, the assumption that a group with voice complaints has higher voice handicap impact than the matched control comparison group is justified for Portuguese speakers.
- Item reduction of the Voice Handicap Index based on the original version and on European translationsPublication . Nawka, T; Verdonck-de Leeuw, IM; De Bodt, M; Guimarães, Isabel; Holmberg, EB; Rosen, CA; Schindler, A; Woisard, V; Whurr, R; Konerding, UObjective: Constructing an internationally applicable shortscale of the Voice Handicap Index (VHI). Methods: Subjects were 1,052 patients with 5 different types of voice disorder groups from Belgium, France, Sweden, Germany, Italy, The Netherlands, Portugal, and the USA. Different 9- and 12-item subsets were selected from the 30 VHI items using (1) the first factor of an unrotated factor analysis (narrow range subsets) and (2) the first three factors after promax rotation (broad range subsets). Country-specific subsets were selected to test deviations from the international subsets. For all subsets, reliability was investigated using Cronbach’s alphas and correlations with the total VHI. Validity was investigated using regression on voice disorder groups. All analyses were performed for the total and for all country-specific subject samples. Results: Reliability was high for all item subsets. It was lower for the international compared to the countryspecific subsets and for the broad range compared to the narrow range subsets. Validity was best for the broad range subsets. Validity was better for the international than for the country-specific subsets. For all statistics the 12-item subsets were not essentially better than the 9-item subsets. Conclusion: The international broad range 9-item subset forms a scale which approximates well the total VHI.