Figure 2From: Assessment of airway hyperreactivity: comparison of forced spirometry and body plethysmography for methacholine challenge tests Accuracy of responses classified as severe, moderate, mild and normal, based on PD+100 for sReff, sRtot, Reff, Rtot, PD-40 for sGeff and sGRtot, and PD-20 for FEV 1 .Back to article page