Table 3.

Inter- and intra-observer variability of CMR feature tracking derived global and regional strain parameters.

	Intra-observer		Inter-observer
	ICC	95% CI	ICC	95% CI
RS, %
Global	0.916	0.773 to 0.971	0.9	0.736 to 0.965
Basal	0.859	0.578 to 0.953	0.749	0.416 to 0.907
Mid	0.924	0.788 to 0.974	0.883	0.693 to 0.959
Apical	0.869	0.651 to 0.954	0.886	0.690 to 0.960
CS, %
Global	0.913	0.764 to 0.970	0.856	0.607 to 0.950
Basal	0.905	0.741 to 0.967	0.885	0.692 to 0.960
Mid	0.929	0.808 to 0.975	0.884	0.612 to 0.963
Apical	0.902	0.732 to 0.966	0.834	0.577 to 0.941
LS, %
Global	0.924	0.716 to 0.976	0.913	0.679 to 0.973
Basal	0.979	0.921 to 0.993	0.954	0.871 to 0.984
Mid	0.9	0.736 to 0.965	0.886	0.637 to 0.963
Apical	0.92	0.768 to 0.973	0.9	0.732 to 0.965

ICC, intraclass correlation coefficient; RS, radial strain; CS, circumferential strain; LS, longitudinal strain.