Flow-Volume Parameters in COPD Related to Extended Measurements of Lung Volume, Diffusion, and Resistance

Figure 3

RV% (a) and TLC%p (b) measured by body plethysmography and single breath helium dilution with CO-diffusion. Difference in RV% (RV%p_BP−SB) (c) and TLC% (TLC%p_BP−SB) (d) measured by body plethysmography and single breath helium dilution with CO-diffusion in controls (healthy smokers) and COPD patients with GOLD stage 1–4. *Significant difference compared to healthy smokers, ^†significant difference compared to GOLD1, ^‡significant difference compared to GOLD2, ^#significant difference compared to GOLD3; ^§significant difference between measurement from body plethysmography compared to single breath helium dilution with CO-diffusion, one symbol flagging 𝑃<0.05, two symbols flagging 𝑃<0.01, and three symbols flagging 𝑃<0.001. Data are presented as median (IQR) in (a)-(b) and individual dots together with median with interquartile range (c)-(d).

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