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Table 4 Intraobserver and interobserver variability

From: Comprehensive assessment of left ventricular myocardial function by two-dimensional speckle-tracking echocardiography

Intraclass correlation coefficient (95% CI)
   p
Intraobserver
 Global longitudinal strain 0.86 (0.53–0,96) <  0.001
 Twist 0.94 (0.65–0.98) <  0.001
 Classic Torsion 0.96 (0.84–0.99) <  0.001
 Torsion index 0.93 (0.63–0.98) <  0.001
 Strain product 0.97 (0.82–0.99) <  0.001
 Strain index 0.85 (0.52–0.96) <  0.001
Interobserver
 Global longitudinal strain 0.87 (0.58–0.96) <  0.001
 Twist 0.85 (0.53–0.96) <  0.001
 Classic Torsion 0.87 (0.59–0.96) <  0.001
 Torsion index 0.80 (0.41–0.94) <  0.001
 Strain product 0.90 (0.65–0.97) <  0.001
 Strain index 0.77 (0.31–0.94) 0.003