Table 7.

Intra-class correlation coefficient (ICC) analysis of intra- and inter-observer variations for strains, twist and torsion of the left ventricle from 3D STE

	Intra-observer variation		Inter-observer variation
	ICC	95% CI	ICC	95% CI
Pre-HD
GPS	0.884	0.707–0.954	0.754	0.415–0.899
GLS	0.957	0.891–0.983	0.821	0.547–0.929
GCS	0.815	0.533–0.927	0.628	0.060–0.853
GRS	0.910	0.773–0.964	0.771	0.422–0.910
Twist	0.825	0.557–0.931	0.936	0.838–0.975
Torsion	0.868	0.666–0.948	0.949	0.870–0.980
Post-HD
GPS	0.898	0.743–0.960	0.619	0.037–0.849
GLS	0.880	0.697–0.952	0.709	0.265–0.885
GCS	0.855	0.633–0.943	0.717	0.285–0.888
GRS	0.923	0.807–0.970	0.814	0.529–0.926
Twist	0.772	0.424–0.910	0.775	0.431–0.911
Torsion	0.713	0.276–0.887	0.746	0.358–0.899

CI confidence interval, 3D three-dimensional, STE speckle tracking echocardiography, HD hemodialysis, GPS global principal strain, GLS global longitudinal strain, GCS global circumferential strain, GRS global radial strain