Fig. 4

Comparison between the ECVm and ECVsyn in groups with the ECVm < 30.5 and > 30.5%. In the group with the ECVm < 30.5%, the paired t-test demonstrated that the ECVsyn was larger than the ECVm in the derivation group (a) and validation group (c). In the group with the ECV > 30.5%, the paired t-test demonstrated that the ECVsyn was smaller than the ECVm in the derivation group (b) and validation group (d)