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Background  Objective acoustic analysis is a key component of multidimensional voice assessment. OperaVOX is an iOS app which has been shown to be comparable to Multi Dimensional Voice Program for most principal measures of vocal function. As a relatively cheap, portable and easily accessible form of acoustic analysis, OperaVOX may be more clinically useful than laboratory-based software in many situations. This study aims to determine whether correlation exists between acoustic measurements obtained using OperaVOX, and perceptual evaluation of voice.    Methods  Forty-four voices from the multidisciplinary voice clinic were examined. Each voice was assessed blindly by a single experienced voice therapist using the GRBAS scale, and analysed using OperaVOX. The Spearman rank correlation co-efficient was calculated between each element of the GRBAS scale and acoustic measurements obtained by OperaVOX.    Results  Significant correlations were identified between GRBAS scores and OperaVOX parameters. Grade correlated significantly with jitter ( ρ  = 0.495,  p  &lt; 0.05), shimmer ( ρ  = 0.385,  p  &lt; 0.05), noise-to-harmonic ratio (NHR;  ρ  = 0.526,  p  &lt; 0.05) and maximum phonation time (MPT;  ρ  = −0.415,  p  &lt; 0.05). Roughness did not correlate with any of the measured variables. Breathiness correlated significantly with jitter ( ρ  = 0.342,  p  &lt; 0.05), NHR ( ρ  = 0.344,  p  &lt; 0.05) and MPT ( ρ  = −0.336,  p  &lt; 0.05). Aesthenia correlated with NHR ( ρ  = 0.413,  p  &lt; 0.05) and MPT ( ρ  = −0.399,  p  &lt; 0.05). Strain correlated with Jitter ( ρ  = 0.560,  p  &lt; 0.05), NHR ( ρ  = 0.600,  p  &lt; 0.05) and MPT ( ρ  = −0.356,  p  &lt; 0.05).    Conclusions  OperaVOX provides objective acoustic analysis which has shown statistically significant correlation to perceptual evaluation using the GRBAS scale. The accessibility of the software package makes it possible for a wide range of health practitioners, e.g. general ENT surgeons, vascular surgeons, thyroid surgeons and cardiothoracic surgeons to objectively monitor outcomes and complications of surgical procedures that may affect vocal function. Given the increasing requirement for surgeons to monitor their outcomes as part of the move towards ‘surgeon reported outcomes’ this may become an invaluable tool towards that goal.

Is OperaVOX a clinically useful tool for the assessment of voice in a general ENT clinic?