an increasing trendP < 0.01
Increase in Lung Volume Measured by Body Plethysmography and Single Breath Helium Dilution with CO-Diffusion Already in GOLD1 An increasing trend among all the groups was seen for TLC%p BP ( P < 0.01), RV%p BP ( P < 0.001), and for VA%p SB ( P < 0.001) using the Kruskal-Wallis test.