Table 4.
Intraobserver and interobserver variations of 3DSTE.
| Intraobserver variability | Interobserver variability | |||
|---|---|---|---|---|
| ICC | p | ICC | p | |
| EDV | 0.988 (0.977–0.993) | 0.000 | 0.962 (0.932–0.979) | 0.000 |
| ESV | 0.982 (0.968–0.990) | 0.000 | 0.960 (0.928–0.978) | 0.000 |
| SV | 0.977 (0.959–0.987) | 0.000 | 0.956 (0.921–0.976) | 0.000 |
| EF | 0.771 (0.618–0.867) | 0.000 | 0.824 (0.702–0.900) | 0.000 |
| GLS | 0.828 (0.708–0.902) | 0.000 | 0.767 (0.613–0.865) | 0.017 |
| GCS | 0.808 (0.677–0.890) | 0.000 | 0.808 (0.643–0.901) | 0.000 |
| Twist | 0.884 (0.799–0.935) | 0.000 | 0.871 (0.778–0.927) | 0.000 |
| Torsion | 0.800 (0.663–0.885) | 0.000 | 0.827 (0.706–0.901) | 0.000 |
| RotationA | 0.984 (0.967–0.992) | 0.000 | 0.862 (0.762–0.921) | 0.000 |
| RotationB | 0.798 (0.661–0.884) | 0.000 | 0.716 (0.537–0.833) | 0.000 |
| TSaverage | 0.783 (0.638–0.875) | 0.000 | 0.784 (0.639–0.875) | 0.000 |
| CSaverage | 0.835 (0.719–0.906) | 0.000 | 0.799 (0.662–0.884) | 0.000 |
| LSaverage | 0.757 (0.597–0.859) | 0.000 | 0.814 (0.686–0.893) | 0.000 |
| RSaverage | 0.850 (0.743–0.915) | 0.000 | 0.785 (0.641–0.876) | 0.000 |
3DSTE, three-dimensional speckle tracking echocardiography; EDV, end diastolic volume; ESV, end systolic volume; EF, ejection fraction; GLS, global longitudinal strain; GCS, global circumstantial strain; RotationA, apical rotation; RotationB, basal rotation; TSaverage, average principal tangential strain; CSaverage, average circumferential strain; LSaverage, average longitudinal strain; RSaverage, average radial strain; ICC, intraclass correlation coefficient.