Fig. 1.

Multiple correspondence analysis (MCA). The figure shows the association of the variables distributed in the four quadrants. Active variables are represented by filled-in squares, the illustrative nominal variables are shown by empty squares and arrows represent illustrative continuous variables. The size of the squares is proportional to each modality's contribution to the most representative factor. The arrow's length shows the correlation of viral load with each factor. The numbers on the axes represent test values, indicating the significance of representation of each modality's variable regarding each factor.