Figure 5a. Graph shows results of regression analysis between inflammatory cell infiltration of the smooth muscle layer and (a) expiratory attenuation or (b) the attenuation difference between inspiratory and expiratory images. A log scale was used for the x axes, since inflammatory cell counts have been log transformed for the regression analyses. ß = regression coefficient, solid line = regression line for chymase-positive mast cells, dotted line = regression line for neutrophils.