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Table 1 shows percentage difference and coefficient of variation (Co-V) for inter-observer and inter-study variability of measured circumferential strain, radial strain and left ventricular twist

From: Reproducibility of strain and twist measurements calculated using CSPAMM tagging

  INTER-OBSERVER VARIABILITY INTER-STUDY VARIABILITY
  Percentage difference (mean (SD)) Co-V % Percentage difference (mean (SD)) Co-V %
circumferential strain apex 6.9 (2.3) 4.4 6.7 (4.1) 8.3
circumferential strain mid LV 8.2 (7.7) 11.2 6.5 (4.0) 7.7
circumferential strain base 6.7 (5.0) 6.8 8.8 (5.3) 10.8
radial strain apex 28.1 (47.8) 19.2 7.3 (6.0) 9.0
radial strain mid LV 17.6 (21.6) 18.2 21.3 (11.1) 30.8
radial strain base 26.7 (25.6) 42.1 35.6 (29.6) 59.2
rotation (twist) apex-base 5.7 (4.3) 4.0 12.3 (9.9) 59.2