Table 5.

Intra- and inter-observer variability of RVFW-LS

	Intra-observer variability			Inter-observer variability
	MD ± SD	ICC (95% CI)	CoV	MD ± SD	ICC (95% CI)	CoV
RVFW-GLS	0.85 ± 0.80	0.94 (0.83–0.98)	3.01	1.66 ± 1.35	0.83 (0.48–0.94)	5.11
RVFW-RLS
Basal	1.82 ± 1.74	0.89 (0.67–0.96)	5.88	1.92 ± 1.46	0.90 (0.71–0.97)	4.88
Middle-cavity	1.64 ± 1.32	0.95 (0.84–0.98)	4.89	1.75 ± 1.95	0.94 (0.82–0.98)	7.18
Apical	2.10 ± 1.37	0.84 (0.54–0.95)	7.43	2.89 ± 1.90	0.72 (0.17–0.91)	10.45
RVFW-SLS
Segment 1	2.48 ± 2.35	0.90 (0.71–0.97)	8.01	2.24 ± 1.39	0.93 (0.80–0.98)	4.66
Segment 2	1.48 ± 1.65	0.87 (0.60–0.96)	5.55	1.93 ± 1.88	0.84 (0.52–0.95)	6.28
Segment 3	1.34 ± 0.86	0.97 (0.90–0.99)	3.00	1.72 ± 1.62	0.95 (0.84–0.98)	5.57
Segment 4	2.48 ± 1.89	0.90 (0.71–0.97)	7.53	2.61 ± 2.69	0.88 (0.66–0.96)	10.70
Segment 5	1.66 ± 1.20	0.90 (0.69–0.97)	5.12	2.73 ± 2.67	0.55 (− 0.35–0.85)	11.52
Segment 6	2.95 ± 2.46	0.83 (0.50–0.94)	18.24	4.09 ± 3.88	0.66 (− 0.01–0.89)	29.65

MD mean difference, SD standard deviation, ICC intra-class correlation coefficient, CI confidence interval, CoV coefficient of variation. The unit of CoV is %