2.7. Statistical Analysis
dementia
Measurement of the variables was performed in all study participants at 4 different times: at baseline, 2 months (after completion of the NNG), 5 months (after completion of the TEG, and 7 months (after 2 months of follow-up). Self-administered questionnaires were used, but since our trial involved patients diagnosed with dementia, the responses were made by the primary caregiver of each patient.Categorical variables were summarized using percentages and relative frequencies. Equality of proportions of the categories was compared using Pearson’s chi-square statistic. In addition, a one-way ANOVA was performed on the three groups to test whether differences were found as a function of age, and Levene’s test was used to test the homogeneity of variances of the groups.The numerical variables were summarized using descriptive statistics (means, standard deviations pretest, at 2 months, at 5 months, and at 7 months). Since their distributions did not follow a normal law and the sample size was low, we chose to compare the three groups with the nonparametric Kruskal–Wallis H test. If the χ2 statistic was significant, the two-by-two comparison between the groups was performed with the Dwass–Steel–Critchlow–Fligner test to analyze the equality between the groups at each time point. The significance level for all analyses was set at 