Table 1.

Inter- and intraobserver variability for measured parameters

	Intraobserver (n = 12)		Interobserver (n = 8)		Test Retest (n = 7)
	Mean difference (SD)	Correlation	Mean difference (SD)	Correlation	Mean difference (SD)	Correlation
Standard EDV, μl	6.9 (18.2)	0.94	4.3 (19)	0.93	7.3 (19.2)	0.87
Standard EF, %	2.3 (4.1)	0.95	4.8 (4.3)	0.89	5.2 (5.1)	0.90
Standard LVM, mg	4.6 (14.6)	0.93	17 (18.6)	0.88	14 (16.2)	0.88
STE EDV, μl	2.7 (17.2)	0.94	3.6 (22.2)	0.94	1 (10.1)	0.92
STE EF, %	2.6 (2)	0.93	4.8 (3.4)	0.94	3.8 (4)	0.91
STE LVM, mg	3.3 (12.3)	0.94	5.4 (14.3)	0.94	4.6 (15.2)	0.92
Global radial strain, %	0.8 (1.1)	0.98	0.7 (1.7)	0.94	1.7 (3.1)	0.85
Radial strain DI, %	0.9 (3.4)	0.90	1.8 (8.1)	0.82	2 (7.2)	0.81
Radial strain rate, %/s	1.1 (0.9)	0.92	1.2 (1.7)	0.83	0.3 (1.1)	0.82
Radial strain rate DI, %	2.5 (7.3)	0.68	2 (13.5)	0.71	1.3 (12.4)	0.78
Global longit. strain, %	1.4 (1.9)	0.96	0.8 (2.7)	0.90	0.6 (1.8)	0.86
Longit. strain DI, %	4.2 (10.2)	0.74	6.6 (12.9)	0.69	1.8 (7.2)	0.79
Longit. strain rate, %/s	1.8 (1.1)	0.85	3.2 (2.3)	0.81	0.4 (1.6)	0.82
Longit. strain rate DI, %	3.7 (9.9)	0.68	5.2 (9.7)	0.64	3.1 (7.2)	0.76

EDV, end-diastolic volume; EF, ejection fraction; LVM, left ventricular mass; PS, peak strain; PSR, peak strain rate; STE, speckle tracking echocardiography; longit., longitudinal; DI, dyssynchrony index