2.9. Statistical Analysis
SECONDARY
Statistical analyses were performed as described in the study protocol [The normality of the variables collected in the study was analyzed using the Kolmogorov–Smirnov test and in cases that did not follow statistical normality, the corresponding non-parametric tests were used. The descriptive analysis presents the results of the categorical variables with the The results of the primary variables (cognitive performance) and secondary variables (quality of life and functional activities) were analyzed by intention to treat (including all subjects who were randomized according to the assigned group). The effect of the intervention on the variables evaluated was analyzed with an analysis of covariance-ANCOVA, with an adjustment for those variables that showed significant differences between both groups in the initial evaluation (withdrawal time). The “center” variable was also included in the analysis model because the study was conducted in two different health centers.