Table 4 Interobserver and intraobserver variability for global strain and synchrony parameters
Parameter | Intraobserver (n = 10) | Interobserver (n = 10) | ||
|---|---|---|---|---|
Mean difference ± SD | ICC | Mean difference ± SD | ICC | |
Left ventricle | ||||
 Circumferential – mid | ||||
 Global strain (%) | 0.25 ± 1.3 | 0.96 | 0.30 ± 1.9 | 0.89 |
 Maximum difference T2P (ms) | 12.5 ± 27.8 | 0.86 | 1.0 ± 38.5 | 0.82 |
 Cross-correlation delay (ms) | 2.8 ± 21.9 | 0.83 | 14.6 ± 31.4 | 0.62 |
 Longitudinal | ||||
 Global strain (%) | 0.33 ± 2.1 | 0.93 | 1.6 ± 3.7 | 0.75 |
 Maximum difference T2P (ms) | 102.3 ± 145 | 0.80 | 40.0 ± 154 | 0.67 |
 Cross-correlation delay (ms) | 25.0 ± 80.7 | 0.73 | 45.8 ± 107 | 0.65 |
Right ventricle | ||||
 Circumferential – mid | ||||
 Global strain (%) | 0.40 ± 1.6 | 0.95 | 0.31 ± 2.0 | 0.88 |
 Maximum difference T2P (ms) | 64.0 ± 126 | 0.82 | 90.6 ± 107.9 | 0.61 |
 Cross-correlation delay (ms) | 104 ± 233 | 0.66 | 93.0 ± 230 | 0.59 |
 Longitudinal | ||||
 Global strain (%) | 1.0 ± 2.8 | 0.85 | 2.6 ± 2.2 | 0.76 |
 Maximum difference T2P (ms) | 146 ± 133 | 0.76 | 157 ± 158 | 0.66 |
 Cross-correlation delay (ms) | 22.4 ± 85.9 | 0.64 | 42.1 ± 118 | 0.53 |