Statistical analysis
Data was collected on an Excel spreadsheet (Microsoft, CA, USA) then
transferred to GraphPad Prism (GraphPad Software, CA, USA) for
statistical and graphical analysis. Classification of left and right
ears were compared using Chi-squared analysis. Audiological data per
classification was compared using Kruskal-Wallis test for non-parametric
data with Dunn’s multiple comparison test used to adjust p-values where
appropriate. Percentage and dBHL were rounded to the nearest whole
number. Non-parametric data is reported as median with 25-75%
inter-quartile range (IQR) and p<0.05 was regarded as
significant. Power analysis revealed a requirement for n=120 to achieve
80% power at the 0.05 significance level.