Objective: To investigate the psychometric properties of the Voice-Related Quality of Life (V-RQOL) questionnaire in Brazilian Portuguese by assessing its reliability and conducting exploratory factor analysis (EFA) and confirmatory factor analysis (CFA).
Methods: This research was carried out in two stages: (1) a document-based retrospective approach and (2) a field study step. The study included 566 dysphonic and vocally healthy individuals. For data collection, the Vocal Screening Protocol and the V-RQOL questionnaire were used, and these measures were later statistically analyzed through descriptive analysis, reliability tests, CFA, and EFA. Ethical issues were considered.
Results: A Cronbach's alpha coefficient of 0.916 was observed, indicating good internal consistency for the V-RQOL questionnaire. The item-total correlation coefficient indicated that the items had good correlation with each other and with the construct, with values higher than 0.30. EFA was performed based on the Kaiser-Meyer-Olkin index and Bartlett's test of sphericity, which indicated the adequacy of the tested sample. The items presented commonality of >0.30 and satisfactory factor loadings, resulting in a single factor. The unifactorial structure of the V-RQOL questionnaire was confirmed by CFA.
Conclusion: EFA and CFA indicated that a single factor should be adopted to encompass all the items of the V-RQOL questionnaire.
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