Fig. 4From: Small airway dysfunction in patients with cough variant asthma: a retrospective cohort studyPredictive value for CVA by combining PD20 and small airway resistance; combination 1: PD20 + FEF50 (% predicted); combination 2: PD20 + FEF75 (% predicted); combination 3: PD20 + MMEF (% predicted)Back to article page