Cross-cultural adaptation and validation of the Voice Handicap Index into Croatian.

This article presents preliminary results of cultural adaptation and validation of the Croatian version of Voice Handicap Index (VHI). The translated version was completed by 38 subjects with voice disorders and 30 subjects without voice complaints. Compared with the subjects in the control group, subjects with voice disorders had significantly higher average total VHI score and scores in each of the three VHI domains (functional, physical, and emotional). Cronbach alpha for total VHI was .94, and coefficients obtained for the three VHI subscales were as follows: α = .87 for functional, α = .88 for physical, and α = .85 for emotional subscales. Intraclass correlation coefficient estimation was also high, for both total VHI (0.92) and subscales (0.85 for functional subscale, 0.87 for physical subscale, and 0.81 for emotional subscale). The overall VHI score positively correlated with auditory perceived grade of dysphonia. In the group with voice disorders, age was not correlated to the total VHI or the subscales. Also, there was no significant difference between male and female voice subjects in total VHI or the subscales. Preliminary findings of this research indicate that the Croatian VHI could provide a reliable and clinically valid measure of patient's current perception of voice problem and its reflection on the quality of life.