Statistical analysis. First stage. Shapiro Wilk test will be performed to see the distribution of the data. Descriptive statistics: mean, standard deviation, percentages and frequencies will be performed. Second stage. Analytical statistics: Intra-groups: Student's T test for dependent samples for parametric data or the Wilcoxon test for non-parametric data. Chi square for analysis of qualitative data. Inter-groups: One-way ANOVA with post hoc (Bonferroni) tests. If the data are not parametric, Kruskal-Wallis and if it is significant, Mann Whitney's U will be performed as post hoc. Third stage. Linear regression and logistic regression will be performed.