“…A Levene's test was employed to evaluate whether the data seta had equal or unequal variances [44] . An independent t-test was conducted where the normality assumption was met, in order to detect for significant differences between the groups' acoustic means (Jitter % , Shimmer % , F0, NHR, Highest dB, Lowest dB, F-Hi and F-Lo) [44] . Where the normality assumption was not met, the Mann-Whitney test, the nonparametric equivalent of the independent t-test, was executed [44] .…”