Purpose: The purpose of this study was to examine the reliability and validity of the Japan Society of Logopedics and Phoniatrics' revised translated version of VHI and VHI-10.
Participants: The participants were 173 adults with voice disorders seen at eight ENT clinics in Japan and 105 normal volunteers. There was no difference in male-to-female ratio between the groups with and without dysphonia.
Analysis: The reliability of VHI and VHI-10 was measured using Cronbach's alpha of internal consistency. Criterion-related validity was assessed by the extent to which VHI predicted the presence or absence of dysphonia.
Results: Cronbach's alpha indications for VHI and VHI-10 were respectively 0.98 and 0.93 for all participants. There were significant differences between the dysphonic and non-dysphonic groups in both VHI and VHI-10.
Conclusion: VHI in the Japan Society of Logopedics and Phoniatrics' version consistently showed reliability. The scores of VHI and VHI-10 can predict the presence or absence of dysphonia.
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