Table 5.

Intra- and inter-observer variability of circumferential and radial strain parameters of the LV at rest and with dobutamine stress

Parameter	Ventricle	Variability	Mean	CI (95%)	p-value
EccSAX	LV	Intra-observer	24.1	22.3-25.8	0.06
			22.7	20.8-24.6
		Inter-observer	24.1	22.3-25.8	0.61
			24.6	22.6-26.6
EccSAX10	LV	Intra-observer	32.7	29.8-35.8	0.09
			31.1	28.3-34.9
		Inter-observer	32.7	29.8-35.8	0.66
			33.4	29.9-37
EccSAX20	LV	Intra-observer	39.2	35.2-43.1	0.25
			41	37.9-43.9
		Inter-observer	39.2	35.2-43.1	0.17
			41.2	37.8-44.6
ErrSAX	LV	Intra-observer	19.6	15.8-23.4	0.86
			19.9	16.5-23.2
		Inter-observer	19.6	15.8-23.4	0.06
			25.4	22.3-28.4
ErrSAX10	LV	Intra-observer	31.8	26.9-37.9	0.2
			34.9	29.9-39.8
		Inter-observer	31.8	26.9-37.9	0.14
			35.5	30.7-40.3
ErrSAX20	LV	Intra-observer	42.4	35.8-48.9	0.31
			44.9	36.2-49.1
		Inter-observer	42.4	35.8-48.9	0.59
			43.5	38.4-48.5

The table shows intra- and inter-observer variability of circumferential and radial strain parameters of the LV derived from a short-axis view at rest and with dobutamine stress (10 and 20 μg · kg^-1· min^-1). 95% Confidence Intervalls of the difference and p-values are given to accurately determine individual variabilities [12]. Ecc_SAX = left ventricular short-axis circumferential strain, Err_SAX = left ventricular short-axis radial strain,