2.4. Statistical analysis
The statistical comparison tests to be used include an analysis of estimation of normality through a
Kolmogorov-Smirnov test. Depending on the results obtained, the average test is adapted where appropriate
(Student's t-test or U-Mann-Whitney-Wilcoxon) to make a comparison between two groups, and an ANOVA or
independent samples k-test is used to compare multiple groups. The complete statistical analysis was carried out by
making use of SPSS v14.0.1 for Windows XP.