Cross-Cultural Adaptation and Validation of the Hong Kong-Chinese Version of Vocal Fatigue Index (VFI(HK))

This study aimed to cross-culturally adapt and validate the Hong Kong-Chinese version of the Vocal fatigue index (VFI(HK)). The original English version of the Vocal fatigue index (VFI) was translated and adapted to the VFI(HK). A total of 206 subjects (87 in the Fatigue group and 119 in the Control group) completed the VFI(HK) and validity, reliability and receiver operating characteristic (ROC) were analysed. The VFI(HK) exhibited satisfactory psychometric properties. It showed good content validity (scale-level content validity indices ≥ 0.842) and excellent internal consistency (Part 1: α = 0.945, Part 2: α = 0.914, Part 3: α = 0.951). Parts 1 and 2 of the questionnaire showed good construct validity (Part 1: t(204) = 5.743, P < 0.001; Part 2: t(204) = 5.049, P < 0.001). Test-retest reliability ranged from acceptable (Part 3: Ρ = 0.702) to good (Part 1: Ρ = 0.885, Part 2: Ρ = 0.827). ROC curves showed acceptable and close-to-acceptable intrinsic accuracies for Parts 1 (Aera under curve (AUC) = 0.712) and 2 (AUC = 0.694) respectively. Cutoff scores of 25 and 10 are suggested for Parts 1 and 2 respectively. The VFI(HK) is a valid and sensitive assessment tool. It may be adopted to identify individuals with vocal fatigue in the Hong Kong-Chinese population.