Fig. 4

Correlations between levels of IgG4 in urine and serum (A), IgG in urine and serum (B), between IgG and IgG4 in urine (C) and between IgG and IgG4 in serum (D). Coefficients of correlation were determined using the Spearman correlation test (rs). Data shown are observed values, and the solid line was calculated from the regression equation (Y = ax + b, Y = log IgG/IgG4, a = slope, x = log IgG/IgG4, b = Y-intercept). Dotted lines (vertical and horizontal) represent the cutoff values