Table 1 shows percentage difference and coefficient of variation (Co-V) for inter-observer and inter-study variability of measured circumferential strain, radial strain and left ventricular twist
From: Reproducibility of strain and twist measurements calculated using CSPAMM tagging
| Â | INTER-OBSERVER VARIABILITY | INTER-STUDY VARIABILITY | |||
|---|---|---|---|---|---|
| Â | Percentage difference (mean (SD)) | Co-V % | Percentage difference (mean (SD)) | Co-V % | |
circumferential strain | apex | 6.9 (2.3) | 4.4 | 6.7 (4.1) | 8.3 |
circumferential strain | mid LV | 8.2 (7.7) | 11.2 | 6.5 (4.0) | 7.7 |
circumferential strain | base | 6.7 (5.0) | 6.8 | 8.8 (5.3) | 10.8 |
radial strain | apex | 28.1 (47.8) | 19.2 | 7.3 (6.0) | 9.0 |
radial strain | mid LV | 17.6 (21.6) | 18.2 | 21.3 (11.1) | 30.8 |
radial strain | base | 26.7 (25.6) | 42.1 | 35.6 (29.6) | 59.2 |
rotation (twist) | apex-base | 5.7 (4.3) | 4.0 | 12.3 (9.9) | 59.2 |