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Italian Vocal Fatigue Index: Cross-Cultural Adaptation and Validation.

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Summary

The Vocal Fatigue Index (VFI) was adapted for Italian speakers (VFI-I). This validated tool accurately identifies vocal fatigue and tracks treatment progress in Italian populations.

Keywords:
Vocal fatigue index—Vocal fatigue—Voice.

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Area of Science:

  • Speech and Hearing Sciences
  • Linguistics
  • Clinical Psychology

Background:

  • Vocal fatigue is characterized by self-reported symptoms and decreased vocal function.
  • The Vocal Fatigue Index (VFI) is a tool to differentiate individuals with vocal fatigue from healthy controls.
  • Adaptation and validation of the VFI for Italian speakers were necessary to assess vocal fatigue in this population.

Purpose of the Study:

  • To translate and validate the Vocal Fatigue Index (VFI) for use with Italian speakers, creating the VFI-I.
  • To establish the VFI-I as a reliable and valid instrument for assessing vocal fatigue in Italian-speaking individuals.
  • To evaluate the VFI-I's sensitivity to clinical diagnosis and its ability to monitor treatment outcomes.

Main Methods:

  • A rigorous four-step process involving translation, expert review, back-translation, and pretesting was used.
  • The preliminary Italian version (VFI-I) was administered to 669 participants, including those with and without voice disorders.
  • Statistical analyses included nonparametric tests, reliability assessments (Cronbach's alpha), and convergent and multivariate validity analyses.

Main Results:

  • Participants with voice disorders exhibited significantly higher VFI-I scores across all factors compared to healthy individuals.
  • The VFI-I demonstrated excellent internal consistency and reliability (Cronbach's alpha: 0.92–0.97).
  • The VFI-I effectively captured treatment-induced changes, showing a significant decrease in Factor-1 scores post-therapy, and showed moderate correlations with VHI-I subscales.

Conclusions:

  • The VFI-I is a reliable and valid tool for identifying vocal fatigue in Italian speakers.
  • The VFI-I demonstrates good sensitivity for clinical diagnosis and can track treatment progress.
  • This validated instrument holds significant potential for enhancing voice care services for Italian-speaking populations.