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Table 2 Intra-observer variability (by the skilled observer)

From: Cardiovascular magnetic resonance myocardial feature tracking using a non-rigid, elastic image registration algorithm: assessment of variability in a real-life clinical setting

  Intra-observer # Bias LOA CV CR ICC (95% CI)
Healthy Volunteer Global ErrSAX 120 −0.33* [−2.9;2.2] 4.7 ±3.6 0.98 (0.98–0.98)
EccSAX 120 −0.13 [−2.0;1.7] 5.0 ±2.6 0.99 (0.98–0.99)
EllLAX 20 0.06 [−1.3;1.4] 4.4 ±1.9 0.89 (0.73–0.95)
Segm. ErrSAX 660 −0.25 [−8.4;7.9] 12.3 ±11.5 0.98 (0.98–0.99)
EccSAX 660 −0.12 [−5.8;5.6] 15.1 ±8.1 0.96 (0.96–0.97)
EllLAX 140 0.14 [−5.9;6.2] 19.4 ±8.6 0.89 (0.85–0.92)
Normal Group Global ErrSAX 87 −0.22* [−2.0;1.6]§ 3.7 ±2.6 1.00 (1.0–1.0)
EccSAX 87 0.08 [−1.1;1.3] 3.7 ±1.7 0.99 (0.99–1.0)
EllLAX 20 0.07 [−1.4;1.5] 5.2 ±2.0 0.95 (0.89–0.98)
Segm. ErrSAX 470 −0.18 [−7.7;7.4]§ 15.3 ±10.7 0.98 (0.97–0.98)
EccSAX 470 0.12 [−4.2;4.5] 13.3 ±6.2 0.97 (0.96–0.97)
EllLAX 140 0.01 [−5.1;5.1] 15.0 ±7.2 0.95 (0.93–0.97)
Patient Group Global ErrSAX 86 −0.23* [−2.1;1.7]§ 4.1 ±2.7 1.00 (1.0–1.0)
EccSAX 86 −0.16* [−1.3;1.0] 4.7 ±1.6 0.99 (0.99–1.0)
EllLAX 18 0.34 [−1.2;1.9] 6.3 ±2.2 0.98 (0.95–1.0)
Segm. ErrSAX 470 −0.20 [−5.7;5.3]§ 11.7 ±7.8 0.99 (0.99–0.99)
EccSAX 470 −0.12 [−3.5;3.2] 12.9 ±4.7 0.98 (0.98–0.98)
EllLAX 126 0.24 [−6.9;7.4] 28.4 ±10.1 0.90 (0.86–0.93)
  1. # - Sample Size; LOA Limits of agreement; CV Coefficient of variation (%); CR Coefficient of repeatability; ICC Intraclass correlation coefficient; CI Coefficient Interval
  2. *p < 0.05, two tailed paired t-test against zero
  3. § p < 0.05, F-test between patient group and normal group for each strain component