Evaluation of the Reliability and Validity of Actors’ Vocal Hygiene Knowledge Questionnaire

Background: one’s voice is one of the most important tools for professionalvoice users, especially actors. actors have limited knowledge of vocal hygienethat leads to vocal abuse and misuse of vocal behavior. for this reason, specialcare must be taken by this group in the form of vocal hygiene. currently, novalidated instrument determines knowledge levels of vocal hygiene educationin actors as professional voice users. the “assessment of actors’ vocal hygieneknowledge” questionnaire is designed to measure actors’ awareness of vocalhygiene. the purpose of this study was to investigate the validity and reliabilityof the “assessment of actors’ vocal hygiene knowledge”.methods: this study was a methodological research that was conducted in twophases of designing and evaluating the validity and reliability of the “assessmentof actors’ vocal hygiene knowledge” questionnaire. the participants in this studywere 150 actors (91 men and 59 women) ranging in age from 18 to 45 years (meanage: 26.13 years and sd=4.7). in this study, content validity ratio (cvr) andcontent validity index )cvi) was used to assess content validity. the reliabilitywas examined using cronbach’s alpha and test-retest.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 alsohad a high test-retest reliability including intra-class correlation coefficient )icc0.91=( with 95% confidence interval.conclusion: the results of this study indicate that the “assessment of actors’vocal hygiene knowledge” questionnaire has good validity and reliability foractors.