Fig. 4
Plot of bronchodilator-induced change in FVC relative to pre-bronchodilator FVC (∆FVC(%Pre−B); top left panel) and relative to predicted normal FVC (∆FVC(%PN); top right panel) as a function of pre-bronchodilator FVC in patients with a ∆FVC ≥ 0.0 L (N = 928). The horizontal dashed line indicates a 12% change. The bottom left panel is the scatter plot of ∆FVC1(%Pre−B) vs. ∆FVC(%PN) with the diagonal dashed line as the line of identity