Table 3.
Intra- and interobserver variability
| EDV | ESV | SV | EF | LVM | |
|---|---|---|---|---|---|
| Intraobserver variability | |||||
| Mean difference ± SD, absolute | 0 ± 4 ml | -1 ± 10 ml | 1 ± 8 ml | 1 ± 6% | 1 ± 3 g |
| Mean difference ± SD, relative | 1 ± 5% | -1 ± 5% | 1 ± 6% | 1 ± 4% of EF | 1 ± 5% |
| Coefficient of variance | 4% | 10% | 8% | 6% | 3% |
| Coefficient of repeatability | 8 ml | 20 ml | 16 ml | 12% | 6 g |
| R2 | 0.96 | 0.87 | 0.85 | 0.47 | 0.97 |
| Intra-class correlation coefficient | 0.99 | 0.96 | 0.96 | 0.81 | 0.99 |
| Interobserver variability | |||||
| Mean difference ± SD, absolute | 3 ± 4 ml | -5 ± 14 ml | 8 ± 7 ml | 4 ± 6% | 1 ± 5 g |
| Mean difference ± SD, relative | 5 ± 6% | -2 ± 6% | 6 ± 6% | 3 ± 4% of EF | 2 ± 9% |
| Coefficient of variance | 4% | 12% | 7% | 7% | 6% |
| Coefficient of repeatability | 8 ml | 28 ml | 14 ml | 12% | 10 g |
| R2 | 0.96 | 0.85 | 0.82 | 0.44 | 0.91 |
| Intra-class correlation coefficient | 0.98 | 0.95 | 0.91 | 0.81 | 0.98 |