Scatter plots showing correlation data for rSBA, hSBA, and IgG (ELISA) along with the Pearson correlation coefficient, r. (A, C, and E) PsA-TT; (B, D, and F) PsA/C; (A and B) rSBA versus hSBA; (C and D) rSBA versus IgG (ELISA); (E and F) IgG (ELISA) versus hSBA.