Figure 4From: Airway responses and inflammation in subjects with asthma after four days of repeated high-single-dose allergen challengeThe PD 20 FEV 1 methacholine on a logarithmic scale before and after the bronchial allergen challenges. The PD20FEV1 decreased significantly from1.30 mg ± 1.08 to 0.45 mg ± 0.72 (p < 0.001).Back to article page