Fig. 3From: The value of bronchodilator response in FEV1 and FeNO for differentiating between chronic respiratory diseases: an observational studyROC curves for ΔFEV1 in predicting ACO diagnosis for COPD with a positive BDT result. ROC, receiver operating characteristic; ΔFEV1, post-bronchodilator forced expiratory volume in 1 s response; COPD, chronic obstructive pulmonary disease; ACO, asthma–chronic obstructive pulmonary disease overlap; BDT, bronchodilation testBack to article page