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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