Correlative and Diagnostic Evaluation of GFI and SIVD in the Clinical Assessment of Dysphonia.

OBJECTIVES

To investigate the correlation, diagnostic accuracy, and predictive value of the Glottal Function Index (GFI) and the Screening Index for Voice Disorder (SIVD) in individuals with and without dysphonia.

METHODS

This prospective study included 116 patients with dysphonia and 100 controls. GFI and SIVD scores were recorded and analyzed using Spearman's correlation, receiver operating characteristic (ROC) curve analysis, and binary logistic regression.

RESULTS

A strong positive correlation was found between GFI and SIVD scores in the overall cohort (r = 0.839, P < 0.001), with the highest correlations observed in Reinke's edema and vocal fold keratosis. Both tools demonstrated excellent diagnostic performance [area under the curve (AUC): GFI = 0.94, SIVD = 0.95] and were identified as independent predictors of dysphonia in logistic regression analysis (GFI: P = 0.017; SIVD: P = 0.001).

CONCLUSION

GFI and SIVD are strongly aligned in assessing dysphonia and demonstrate high diagnostic and predictive validity, supporting their interchangeable use in clinical settings.