Fig. 1

Pulmonary function tests. Results of the flow-volume loop for the first forced breath: FEV₁ = 0.90 L, FVC = 2.02 L, FEV₁/FVC = 0.45, PEF = 1.64 L/s, MEF75 = 0.95 L/s, MEF50 = 0.38 L/s, MEF25 = 0.11 L/s, MEF75/25 = 0.27 L/s