FIGURE 2. Grouping by EDV and ESV values. Mean and individual EDV values are shown for the 40 patients with supine EDV 146 mL (A) and for the 17 patients with supine ESV 58 mL (B). The 2 groups lie within the same supine volume range, indicated by dashed lines, and some overlap of patients occurs between them. P values from Wilcoxon signed rank tests are shown.