Figure 6

Four quadrants plot relating ΔEELV WI-WO with ΔEELV CT between consecutive measurements. Continuous black lines are quadrant limits. Dotted line is the regression line. Dashed line is the line of identity. Each data point is the change in end-expiratory lung volume (EELV) between consecutive measurements assessed with the nitrogen washin-washout technique (ΔEELVWI-WO) or computed tomography (ΔEELVCT).