Validation of the Acoustic Voice Quality Index (AVQI) Version 03.01 in Italian.

OBJECTIVE The aim of the present study is to validate the Acoustic Voice Quality Index version 03.01 in the Italian language (AVQIv3-IT). METHODS A total of 150 native Italian speakers with normal voices (n = 50) and with various voice disorders (n = 100) were enrolled. Voice samples of a sustained vowel (SV) [a:] and five phonetically balanced continuous speech (CS) samples were recorded. The most appropriate syllable number for a standardized voiced CS approximating 3 seconds was identified. Perceptual evaluations of the overall voice quality were performed by three expert voice clinicians using the G score of the GRBAS scale. AVQIs were calculated using a 3 seconds mid-vowel selection of the SV [a:] and the standardized syllable number of the CS. Finally, concurrent validity and diagnostic accuracy of AVQIv3-IT were analysed. RESULTS The most appropriate syllable number for a standardized CS approximating 3 seconds in Italian was identified as 25. The perceptual ratings showed robust intra- and inter-rater reliability. A strong correlation was found between AVQI scores and overall voice quality perceptual evaluations (r = 0.81, P < 0.001). The best diagnostic outcome for AVQIv3-IT was found for a threshold of 2.35 (sensitivity of 90% and specificity of 92%). CONCLUSIONS AVQIv3-IT was demonstrated to be a valid and robust tool for quantifying overall acoustic voice quality in the Italian speaking population.