Spearman correlation analysis of pneumococcal antibodies in 57 individuals with plaque psoriasis who had sequential vaccinations with PCV13 (at month 0) and PPSV23 (at month 6). Using a commercially available ELISA that measured antibodies against 23 serotypes (global ELISA), the concentrations of IgG, IgG2, IgA, and IgM antibodies were assessed. The heading’s numbers (0–7) denote the time points (month 0–month 7). Correlation coefficients are represented by the numbers in the table, which are colored according to their level of significance.