Table 2.
Left ventricular GLS intra- and inter-observer reproducibility
| Resolution | Intra-Observer | Inter-observer | |||||
|---|---|---|---|---|---|---|---|
| Spatial (mm) | Temporal (frames/cycle) | Mean difference (SD of the Diff.) | ICC (95% CI) | CoV (%) | Mean difference (SD of the Diff.) | ICC (95% CI) | CoV (%) |
| 5 | 20 | 0.13 (3.11) | 0.96 (0.95–0.97) | 15.0 | 0.36 (5.10) | 0.87 (0.83–0.90) | 24.8 |
| 5 | 30 | 0.05 (3.36) | 0.95 (0.94–0.96) | 15.2 | 0.62 (5.34) | 0.86 (0.82–0.89) | 24.6 |
| 5 | 40 | 0.27 (3.00) | 0.96 (0.95–0.97) | 13.3 | 0.59 (5.31) | 0.86 (0.83–0.89) | 24.0 |
| 5 | 50 | 0.38 (4.55) | 0.91 (0.89–0.93) | 19.8 | 0.23 (5.31) | 0.87 (0.83–0.90) | 23.4 |
| 8 | 20 | 0.55 (3.31) | 0.95 (0.94–0.96) | 15.3 | 0.90 (5.14) | 0.86 (0.82–0.89) | 24.6 |
| 8 | 30 | 0.18 (3.26) | 0.96 (0.95–0.97) | 15.0 | 0.83 (5.53) | 0.86 (0.82–0.89) | 26.0 |
| 8 | 40 | 0.51 (3.43) | 0.95 (0.93–0.96) | 15.6 | 0.16 (5.58) | 0.85 (0.81–0.88) | 25.7 |
| 8 | 50 | 0.70 (4.48) | 0.92 (0.90–0.94) | 19.2 | 0.59 (5.35) | 0.88 (0.84–0.90) | 23.6 |
| 10 | 20 | 0.54 (3.57) | 0.95 (0.94–0.96) | 16.8 | 0.44 (5.30) | 0.89 (0.86–0.91) | 25.6 |
| 10 | 30 | 0.36 (3.72) | 0.95 (0.94–0.96) | 16.2 | 0.69 (5.96) | 0.87 (0.83–0.90) | 26.5 |
| 10 | 40 | 0.02 (3.64) | 0.96 (0.95–0.97) | 15.7 | 0.75 (6.23) | 0.86 (0.81–0.89) | 27.3 |
| 10 | 50 | 0.00 (4.37) | 0.94 (0.93–0.96) | 18.2 | 1.04 (5.94) | 0.88 (0.84–0.91) | 25.5 |
SD standard deviation, Diff difference, ICC intraclass correlation coefficient, CoV coefficient of variation, LV left ventricular, GLS global longitudinal strain (n = 252 data points)