Data were assessed for normality by using the D'Agostino and Pearson omnibus normality test and are presented as mean (±standard deviation) or median (interquartile range); parametric or non-parametric equivalent tests were used as appropriate.
Statistical analyses were conducted according to the normality of data which was determined by using the D'Agostino and Pearson omnibus normality test.
Data were tested for normality by using the Shapiro Wilk test.
Data were tabulated, and the offset values were analyzed for normality by using the Shapiro Wilk test, and then submitted to analysis of variance (ANOVA; two factors), considering the whitening and antioxidant factors.
Prior to analysis all acoustic parameters were BoxCox-transformed to approach normality by using the R package car [32].
Data were assessed for normality by using the Shapiro-Wilk test and presented as mean ± SD.
Continuous variables were assessed for normality by using the Kolmogorov-Smirnov test.
Quantitative data was assessed for normality by using the Shapiro-Wilk test.
Data were tested for normality by using the Kolmogorov-Smirnov test.
Variables were tested for normality by using the Shapiro-Wilk test.
