Table 4.

Interobserver and intraobserver variability for global strain and synchrony parameters

Parameter	Intraobserver (n = 10)		Interobserver (n = 10)
	Mean difference ± SD	ICC	Mean difference ± SD	ICC
Left ventricle
Circumferential – mid
Global strain (%)	0.25 ± 1.3	0.96	0.30 ± 1.9	0.89
Maximum difference T2P (ms)	12.5 ± 27.8	0.86	1.0 ± 38.5	0.82
Cross-correlation delay (ms)	2.8 ± 21.9	0.83	14.6 ± 31.4	0.62
Longitudinal
Global strain (%)	0.33 ± 2.1	0.93	1.6 ± 3.7	0.75
Maximum difference T2P (ms)	102.3 ± 145	0.80	40.0 ± 154	0.67
Cross-correlation delay (ms)	25.0 ± 80.7	0.73	45.8 ± 107	0.65
Right ventricle
Circumferential – mid
Global strain (%)	0.40 ± 1.6	0.95	0.31 ± 2.0	0.88
Maximum difference T2P (ms)	64.0 ± 126	0.82	90.6 ± 107.9	0.61
Cross-correlation delay (ms)	104 ± 233	0.66	93.0 ± 230	0.59
Longitudinal
Global strain (%)	1.0 ± 2.8	0.85	2.6 ± 2.2	0.76
Maximum difference T2P (ms)	146 ± 133	0.76	157 ± 158	0.66
Cross-correlation delay (ms)	22.4 ± 85.9	0.64	42.1 ± 118	0.53

ICC intraclass correlation coefficient, T2P time-to-peak, SD standard deviation