Fig. 3From: The total-breath method yields higher values of DLCO and TLC than the conventional methodRelationship of the difference between DLCOTB and DLCOCS (panel A) and their ratio (panel B) to the Z-Score of FEV1/FVC. The horizontal lines indicate a ratio of one or a difference of zero, respectively, and the three groups of healthy control subjects and patients of GOLD grades 1/2 or 3/4 are indicated by different symbols and colorsBack to article page