Fig. 4

Receiver operating characteristic (ROC) curve analysis for differentiating β thalassaemia major patients from the control group. A ROC curve analysis of the left ventricle global circumferential strain (GCS) showing an area under the curve of 0.818 (P = 0.003). B ROC curve analysis of the left ventricle global radial strain (GRS) showing an area under the curve of 0.792 (P = 0.006)