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.