Table 3. Inter-vendor agreement and intra-vendor reproducibility at intra- and inter-observer levels for global longitudinal, global circumferential and global radial strain based on one measurement (R1).
| TomTec versus QStrain | TomTec | QStrain | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean Difference (SD of the Diff.) |
ICC (95% CI) | CoV (%) | Mean Difference (SD of the Diff.) | ICC (95% CI) | CoV (%) | Mean Difference (SD of the Diff.) |
ICC (95% CI) | CoV (%) | ||
| Intra-observer | LV GLS % | 1.06 (2.92) | 0.95 (0.88–0.98) | 16.49 | -0.09 (1.02) | 1.00 (0.99–1.00) | 5.97 | 0.16 (1.10) | 1.00 (0.99–1.00) | 6.00 |
| GCS % | 0.82 (2.91) | 0.98 (0.94–0.99) | 12.29 | -0.55 (0.82) | 1.00 (0.99–1.00) | 3.57 | 0.09 (1.00) | 1.00 (0.99–1.00) | 4.13 | |
| GRS % | -12.57 (10.07) | 0.63 (0.00–0.88) | 39.16 | -0.36 (4.42) | 0.93 (0.83–0.97) | 22.52 | -2.68 (8.22) | 0.92 (0.80–0.97) | 24.64 | |
| RV GLS % | 3.17 (5.98) | 0.80 (0.47–0.92) | 31.15 | -0.35 (1.64) | 0.99 (0.97–1.00) | 9.39 | 0.59 (1.53) | 0.99 (0.98–1.00) | 7.25 | |
| Inter-observer | LV GLS % | 0.59 (2.68) | 0.96 (0.91–0.99) | 14.80 | 0.64 (1.35) | 0.99 (0.97–1.00) | 7.75 | -0.08 (1.14) | 0.99 (0.98–1.00) | 6.25 |
| GCS % | 0.92 (2.56) | 0.98 (0.95–0.99) | 10.80 | 0.00 (1.11) | 1.00 (0.99–1.00) | 4.75 | -0.07 (1.01) | 1.00 (0.99–1.00) | 4.21 | |
| GRS % | -15.55 (10.66) | 0.48 (0.00–0.81) | 39.62 | 0.29 (3.37) | 0.95 (0.87–0.98) | 17.49 | 4.85 (8.58) | 0.87 (0.62–0.95) | 29.00 | |
| RV GLS % | 2.92 (7.68) | 0.71 (0.29–0.88) | 38.57 | 0.84 (2.46) | 0.97 (0.93–0.99) | 13.61 | 0.39 (1.56) | 0.99 (0.98–1.00) | 7.42 | |
SD, standard deviation; Diff., differences; ICC, intra-class correlation coefficient; CoV, coefficient of variation; CI, confidence interval; LV GLS, global left ventricular longitudinal strain; GCS, global left ventricular circumferential strain; GRS, global left ventricular radial strain; RV GLS, global right ventricular longitudinal strain