Relationship between √Aaw at Pi10 and the LAV% in 105 COPD patients.

The horizontal line shows the third quartile of the LAV% of the non-COPD smokers. The vertical line shows the third quartile of the √Aaw at Pi10 of the non-COPD smokers. Using these cut-off values, the COPD patients can be divided into 4 phenotypes; normal by CT (NCT; low LAV% and low √Aaw at Pi10), airway-dominant (AD; low LAV% and high √Aaw at Pi10), emphysema-dominant (ED; high LAV% and low √Aaw at Pi10) and mixed (Mixed; high LAV% and high √Aaw at Pi10) phenotypes.