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.