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 ).