Background: In recent years, some voice indices have been developed for multiparametric objective voice evaluation. This study aims to review these indices and examine their efficiency through literature.
Methods: This study design is traditional narrative review. Five databases, including ‘PubMed’, ‘Scopus’, ‘Google Scholar’, ‘Science Direct’, and ‘Web of Science’ were searched by keywords including ‘voice index’, ‘acoustic’, ‘voice assessment’, and ‘acoustic analysis’. It was attempted to include only the acoustic indices that are validated and fairly user-friendly.
Results: Five voice indices were found that met the inclusion criteria: Dysphonia Severity Index (DSI), Acoustic Voice Quality Index (AVQI), Cepstral Spectral Index of Dysphonia (CSID), The Acoustic Breathiness Index (ABI), and Acoustic Psychometric Severity Index of Dysphonia (APSID).
Conclusions: The results do suggest using AVQI, ABI, DSI, and CSID in the evaluation and treatment of voice disorders. Of course, it is recommended to examine the efficacy of these indices in more languages and also developing new indices by considering more aspects of voice.