Figure 1From: Development of a tool to recognize small airways dysfunction in asthma (SADT)Flowchart of the study with the selection of the study population. ATS: American Thoracic Society, BHR: Bronchial hyperresponsiveness, FEV1= Forced expiratory flow in one second, FVC= forced vital capacity, FEF50%= forced expiratory flow at 50% of the FVC, LLN: lower limit of normal, R5-R20: Difference between the resistance at 5 Hz and 20 Hz.Back to article page