Figure 4.
Correlation matrix for pairwise associations between antigen-specific antibody levels. It shows correlation plots in the bottom left part, histograms of antibody titre distribution in the diagonal and the corresponding absolute correlation coefficients and the level of statistical significance (Spearman correlation test) in the upper right part. •Statistical significance at P < 0.05; *Significance at P < 0.01; **Significance at P < 0.001; ***Significance at P < 0.0001.