There is no obstructive disease.

In COPD, the FEV1 is decreased to a greater extent than the Vital Capacity, leading to a reduced FEV1/FVC ratio. Normal (or elevated) ratios can occur in restrictive disease, such as pulmonary fibrosis, where both the FEV1 and Vital Capacity are reduced. The FEV1 and Vital Capacity result in this data would fit a restrictive pattern.

                             % of normal value
FEV1                               72%
Vital Capacity                     72%
FEV1/FVC                           1.0
Diffusion capacity
    Single breath                  61%
    Steady-state                  108%
Pulmonary dead space              136%
Dead space/Total lung capacity     43% of TLC (normal <35%)