Table 2.
Repeatability measurements
| One-segment intra-rater | One-segment inter-rater | Two-segment intra-rater32 33 | Two-segment inter-rater32 33 | |
|---|---|---|---|---|
| PSS ICC | 0.99 (0.95 to 1) | 0.98 (0.93 to 0.99) | 0.89 (0.80 to 0.94) | 0.76 (0.56 to 0.87) |
| PSSR ICC | 0.97 (0.92 to 0.99) | 0.93 (0.77 to 0.98) | 0.86 (0.74 to 0.92) | 0.76 (0.57 to 0.87) |
| PSS Mean error % | 5 (3 to 7) | 6 (3 to 9) | 15 (10 to 21) | 34 (23 to 44) |
| PSSR Mean error % | 6 (3 to 9) | 8 (4 to 12) | 19 (15 to 23) | 27 (18 to 36) |
| PSS COV % | 5.9 | 7.5 | 21.9 | 38.0 |
| PSSR COV % | 7.2 | 11.7 | 24.1 | 31.8 |
COV, coefficients of variance (mean); ICC, intra-class correlation coefficients (mean (95% CI)); mean error, (mean (95% CI)); PSS, peak systolic strain; PSSR, peak systolic strain rate; PSS, peak systolic strain; PSSR, peak systolic strain rate; 95% CI: 95% CI for mean.