Table 4.

Inter- and intra-observer agreement for nine randomly chosen cases (three control, three HFpEF, and three HFrEF).

Variable	Variability	Mean bias ±SD	Limits of agreement	Coefficient of variation (%)	ICC (95% CI)
${\mathrm{\epsilon }}_{\mathrm{C}\mathrm{C}}^{\mathrm{R}\mathrm{V}}$	Intra-observer	0.20 ± 1.31	-2.38 to 2.78	10.40	0.954 (0.799, 0.990)
	Inter-observer	1.00 ± 1.24	-1.43 to 3.43	11.89	0.964 (0.839, 0.992)
${\mathrm{\epsilon }}_{\mathrm{C}\mathrm{C}}^{\mathrm{L}\mathrm{V}}$	Intra-observer	0.08 ± 0.63	-1.16 to 1.32	4.18	0.997 (0.988, 0.999)
	Inter-observer	0.67 ± 0.90	-1.10 to 2.45	7.27	0.994 (0.973, 0.999)
${\mathrm{\epsilon }}_{\mathrm{C}\mathrm{C}}^{\mathrm{S}\mathrm{e}\mathrm{p}}$	Intra-observer	0.56 ± 0.51	-0.45 to 1.58	11.27	0.989 (0.843, 0.998)
	Inter-observer	0.55 ± 1.73	-2.85 to 3.95	23.35	0.952 (0.787, 0.989)
${\mathrm{\epsilon }}_{\mathrm{L}\mathrm{L}}^{\mathrm{R}\mathrm{V}}$	Intra-observer	-0.91 ± 1.56	-3.97 to 2.15	9.30	0.940 (0.728, 0.987)
	Inter-observer	-0.27 ± 1.57	-3.35 to 2.81	8.48	0.945 (0.758, 0.988)
${\mathrm{\epsilon }}_{\mathrm{L}\mathrm{L}}^{\mathrm{L}\mathrm{V}}$	Intra-observer	-0.54 ± 0.86	-2.23 to 1.14	5.77	0.989 (0.944, 0.998)
	Inter-observer	-0.56 ± 1.42	-3.35 to 2.23	8.98	0.974 (0.883, 0.994)
${\mathrm{\epsilon }}_{\mathrm{L}\mathrm{L}}^{\mathrm{S}\mathrm{e}\mathrm{p}}$	Intra-observer	-1.23 ± 1.35	-3.89 to 1.42	9.11	0.963 (0.692, 0.993)
	Inter-observer	-1.32 ± 2.38	-6.00 to 3.35	14.78	0.921 (0.649, 0.982)
${\mathrm{\epsilon }}_{\mathrm{R}\mathrm{R}}^{\mathrm{R}\mathrm{V}}$	Intra-observer	1.28 ± 4.23	-7.01 to 9.57	12.41	0.953 (0.805, 0.989)
	Inter-observer	4.97 ± 3.52	-1.94 to 11.88	20.39	0.953 (0.794, 0.990)
${\mathrm{\epsilon }}_{\mathrm{R}\mathrm{R}}^{\mathrm{L}\mathrm{V}}$	Intra-observer	0.47 ± 2.47	-4.36 to 5.31	6.15	0.997 (0.987, 0.999)
	Inter-observer	5.63 ± 8.30	-10.63 to 21.90	28.09	0.948 (0.769, 0.988)
${\mathrm{\epsilon }}_{\mathrm{R}\mathrm{R}}^{\mathrm{S}\mathrm{e}\mathrm{p}}$	Intra-observer	-0.87 ± 1.12	-3.06 to 1.31	8.74	0.995 (0.965, 0.999)
	Inter-observer	1.00 ± 2.29	-3.49 to 5.50	15.33	0.986 (0.939, 0.977)

${\mathit{\epsilon }}_{\mathit{C}\mathit{C}}^{\mathit{R}\mathit{V}}$, right ventricular peak circumferential strain; ${\mathit{\epsilon }}_{\mathit{C}\mathit{C}}^{\mathit{L}\mathit{V}}$, left ventricular peak circumferential strain; ${\mathit{\epsilon }}_{\mathit{C}\mathit{C}}^{\mathit{S}\mathit{e}\mathit{p}}$, septum peak circumferential strain; ${\mathit{\epsilon }}_{\mathit{L}\mathit{L}}^{\mathit{R}\mathit{V}}$, right ventricular peak longitudinal strain; ${\mathit{\epsilon }}_{\mathit{L}\mathit{L}}^{\mathit{L}\mathit{V}}$, left ventricular peak longitudinal strain; ${\mathit{\epsilon }}_{\mathit{L}\mathit{L}}^{\mathit{S}\mathit{e}\mathit{p}}$, septum peak longitudinal strain; ${\mathit{\epsilon }}_{\mathit{R}\mathit{R}}^{\mathit{R}\mathit{V}}$, right ventricular peak radial strain; ${\mathit{\epsilon }}_{\mathit{R}\mathit{R}}^{\mathit{L}\mathit{V}}$, left ventricular peak radial strain; ${\mathit{\epsilon }}_{\mathit{R}\mathit{R}}^{\mathit{S}\mathit{e}\mathit{p}}$, septum peak radial strain.