Figure 2From: The relationship between inspiratory lung function parameters and airway hyper-responsiveness in subjects with mild to moderate COPDThe ROC curves for predicting the occurrence of an FEV 1 decrease ≥20% using the changes from the baseline values (%) of the FIV 1 , IC, FIF 50 and PIF. The areas under the curve are 0.78, 0.78, 0.71 and 0.66. The dotted line represents a test with no predictive value.Back to article page