Background: Voice is one of the most important tools for professional voice users, especially actors. For this reason, special care is needed for this group in the form of vocal hygiene. In this study, "assessment of actors' vocal hygiene knowledge" questionnaire is designed with the aim of measuring actors' awareness from vocal hygiene and the validity and reliability of "assessment of actors' vocal hygiene knowledge" questionnaire are investigated.
Methods This research was a methodological study that was conducted in two phases of designing and evaluating the validity and reliability of the "assessment of actors' vocal hygiene knowledge " questionnaire. The participants of this study were 150 actors (91 boys and 59 girls) ranging in age from 18 to 45 years (mean age: 26.13 years and SD = 4.7). In this study, content validity ratio and content validity index were used to assess content validity. Test validity was calculated using Cronbach's alpha coefficient and test-retest reliability.
Results: All test items had good content validity (CVR> 0.62 and CVI> 0.79). Cronbach's alpha coefficient for the whole test was 0.75. The questionnaire also had a high test-retest reliability including ICC = 0.91 with 95% confidence interval.
Conclusion: The results of this study indicate that the "assessment of actors' vocal hygiene knowledge " questionnaire has a good validity and reliability for actors.
Keywords: Vocal Hygiene, Validity and Reliability, Actors, Vocal Knowledge