Derived asthma phenotypes by lung function
Cluster 1 had the lowest post-bronchodilator FEV1/FVC ratio and the second highest reversibility after bronchodilator therapy among the clusters. Conversely, cluster 4 had the highest FEV1/FVC ratio and the lowest reversibility score. Clusters 2 and 3 were in-between clusters 1 and 4 in lung function (Figure 3 ).