Figure 4. Assessment of left ventricular function by the global performance index (GPI).

(a) The 3D global performance plot showing different left ventricular performance in group I patients (black), group II patients (blue), and controls (red). The centre point for each group represents the mean of the values in the x-, y-, and z-axes. (b) Box-plots showing the GPI in the three groups of subjects. The dotted line represents the 10^th centile line derived from normal control data. (c) The receiver–operator characteristic curve for GPI to discriminate between patients (group I and II) and controls. AUC, area under curve.