Analysis of the relation between IL-17 protein expression and clinical variables in the group of patients with depression showed only a statistically significant correlation between IL-17 protein expression and the number of hospitalizations (Spearman’s rank correlation coefficient ρ = 0.209; p = 0.042), indicating that patients with multiple hospitalizations had higher IL-17 protein expression (Figure 8). This evidence concerns the gene IL17A and depressive symptom measurement.