Table 2.

Inter-observer variability and minimum detectable difference for EF measurements in each EF group.

EF (%)	ICC	RME	SEM	MDD
<53	0.99	2.3 (0.3–3.8)	1.1	3.0
53–60	0.81	1.5 (0.0–3.4)	1.3	3.6
>60	0.96	1.0 (0.0–2.4)	1.1	3.0

Relative mean error (RME) is calculated as a percent and expressed as median (interquartile range). The standard error of measurement (SEM) and the minimum detectable difference (MDD) have the same units as the measurement of interest.

EF, ejection fraction; ICC, intra-class correlation coefficient.