Perceptual Analysis (GRBAS score)

Auditory perceptual assessment that is based on text was performed using the GRBAS (overall grade of hoarseness, roughness, breathiness, asthenia, and strain) rating scale. A score from 0 to 3 was applied to each parameter, where 0 represents the euphonic condition and higher scores indicate worse voice quality. The voice samples were evaluated by a jury of three otolaryngology specialists who have at least 2 years of professional experience in acoustic analysis and were all blinded to the groups. Each listener provided their own scores and the final score was based on the mean of the three scores. Mean values and standard deviations of the five components of the GRBAS score were recorded for all subjects independently for each rater and for each of the two ratings. Inter- and intra-rater reliability coefficients were calculated.