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Residual volume (RV) plot. plotted values of differences between RV (in ml) measured with plethysmography and CT (ΔRV) and given as percent deviation (100% * (plethysmography - CT)/Plethysmography). Black line represents standard deviation when available. Each colour represents a patient group. Blue: mixed. Green: healthy. Black: obstructive. [7–13].
