Fig. 2From: The association between transfer coefficient of the lung and the risk of exacerbation in asthma-COPD overlap: an observational cohort studyThe exacerbation-free rate in one year according to the levels of diffusion capacity or transfer coefficient of the lung. Low and preserved DLCO were defined as DLCO % pred < 80% and ≥ 80%, respectively. In the same manner, low and preserved KCO indicated KCO % pred < 80% and ≥ 80%, respectivelyBack to article page