Statistical analyses
Statistical analyses were performed using SPSS Statistics ver. 20.0.
One-way ANOVAs were used to assess mean hearing threshold by frequency. The relationships between tumour volume, VOR gain, and MVSP of VIN were analysed by linear regression analysis.
A receiver operating characteristic (ROC) curve was used to determine the cut-off values for VOR gain, latency, and velocity of the refixation saccades and MVSP of the different VIN stimulation levels.
Sensitivity and specificity were calculated based on the presence of nystagmus in any of the VIN protocol stimulation sites or refixation saccades in the vHIT register.