Adaptation and Validation of Vocal Fatigue Index (VFI) to Malayalam Language

Athira, Usha Rajan; Devadas, Usha

doi:10.1016/j.jvoice.2019.03.002

Cited by 25 publications

(8 citation statements)

References 17 publications

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“…The previously-established threshold ≤ 7.5 for factor 3, now cluster 2, was almost identical to that found on analyses of some other languages, which ranged from ≤7.0 21 to ≤7.5. 23 Despite a good specificity of 80%, the sensitivity for cluster 2 was only approximately 50 % and thus insufficiently accurate for acceptable diagnostic use.…”

Section: Discussionmentioning

confidence: 99%

“…Factor 2 of the VFI-G also showed a significantly lower clinical threshold for discriminating the presence or absence of physical discomfort than other validation studies of the VFI, a finding which may indicate bias. 21,23,28 We, therefore, followed the recommendation of Nanjundeswaran et al 30 to restructure and reorder the VFI-G for further analysis. This adapted version of the VFI contains two clusters: cluster 1 represents the combined factors 1 and 2, and cluster 2 is the unchanged factor 3.…”

Section: Subjectsmentioning

confidence: 99%

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The German Restructured Vocal Fatigue Index and Characteristics of Dysphonic and Vocally Healthy Populations

et al. 2023

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The Vocal Fatigue Index (VFI), a 19-item psychometric self-report questionnaire, enables individuals with vocal fatigue (VF) to be identified and their complaints to be characterized. The purpose of this study was to improve the German-language version (VFI-G) and to evaluate further vocal fatigue-related characteristics of dysphonic and control populations. Methods. The VFI-G was restructured by replacing the three factors that structured the original: (1) tiredness of voice and voice avoidance; (2) physical discomfort; and (3) improvement of symptoms with rest, with two clusters developed on the basis of the results of a factor analysis by Nanjundeswaran et al. (2019). The two new clusters are: (1) tiredness and avoidance plus physical discomfort; and (2) symptom improvement through rest. One hundred one (101) individuals with voice disorders and 100 vocally healthy controls from a previous study that crossvalidated the VFI-G participated in this study. In order to assess the validity of our newly adjusted VFI-G, independent samples t test, receiver operating characteristic curve, likelihood ratios and the Youden Index were calculated. The association of the two VF clusters with subject characteristics such as age, sex, type of voice disorder, and level of vocal usage was also analyzed using either a Pearson correlation or a one-way ANOVA for each of the two populations. Results. Significantly higher scores were obtained in voice-disordered subjects in both clusters (all P values < 0.001) than in healthy-voice subjects. The threshold for cluster 1 of the VFI-G was determined as ≥17.5 (74.3% sensitivity and 88.0% specificity). The results of cluster 2 are identical to that of factor 3 of the previous cross-validation study of the VFI-G. Most subject characteristics show no significant association with cluster 1 of the VFI-G, but cluster 2 seems to be moderately associated with age, type of voice disorder and level of vocal usage in the dysphonic population. Conclusions. The restructured VFI-G showed improved validity and can be recommended for use in the assessment of VF. Cluster 2 is also moderately associated with several vocal fatigue-related subject characteristics of the dysphonic population.

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Section: Discussionmentioning

confidence: 99%

Section: Subjectsmentioning

confidence: 99%

The German Restructured Vocal Fatigue Index and Characteristics of Dysphonic and Vocally Healthy Populations

et al. 2023

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“…Naderifar et al reported internal consistency coefficients of 0.95, 0.86, and 0.83, respectively, according to their study of the VFI after it was translated and adapted into Persian [13]. Athira and Devadas reported these coefficients to be 0.922, 0.923, and 0.925, respectively, in their VFI, adapted into the Malayalam language, and tested in teachers with voice disorders [14]. In our study, the reliability of each and every item in the Turkish version of the VFI was evaluated by calculating Cronbach's alpha internal consistency coefficient.…”

Section: Discussionmentioning

confidence: 99%

“…Therefore, they evaluated the ability of the VFI to differentiate patients with voice complaints from control subjects without voice complaints and reported that the scale was able to detect symptoms of vocal fatigue in individuals with voice disorders [11]. Similarly, in the Malayalam and Persian version studies, significantly higher factor scores were reported in patients with voice disorders compared to individuals without voice complaint [13,14].…”

Section: Discussionmentioning

confidence: 99%

“…In order to compare scientific data obtained from different societies, it would be necessary to study and determine whether the measurement tools are reliable and valid for the target society with standardized procedures [12]. Cross-cultural adaptation, reliability, and validity studies of the VFI have been conducted in different languages [13,14]. There is no such scale in the Turkish language to measure the symptoms of vocal fatigue.…”

Section: Introductionmentioning

confidence: 99%

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Reliability and validity of the Turkish version of the Vocal Fatigue Index

Şirin

Bilgen

2020

Turk J Med Sci

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Background/aim The aim of this study is to evaluate the reliability and validity of the Turkish version of the Vocal Fatigue Index (VFI). Materials and methods The study was conducted with 535 participants including 285 patients with voice disorders and 250 healthy controls. Internal consistency and test-retest reliability were calculated for the reliability analysis. The mean VFI factor scores of both groups were compared. The strength and direction of the relation between VFI and Voice-Related Quality of Life (V-RQOL) measure was evaluated for the validity analysis. Results The Cronbach’s alpha coefficient of VFI factor scores was found to be 0.920 for tiredness and avoidance of voice use, 0.879 for physical discomfort with voice use, and 0.882 for improvement of symptoms with voice rest. The test-retest reliability revealed 0.877 for the tiredness and avoidance of voice use, 0.913 for the physical discomfort with voice use, and 0.820 for the improvement of symptoms with voice rest. When compared with healthy individuals, VFI factor scores were statistically significant higher in patients with voice disorders. The V-RQOL scores decreased significantly as the VFI scores increased. Conclusion The Turkish version of the VFI is a good reliable and valid instrument for evaluating vocal fatigue symptoms in the Turkish-speaking community.

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