Table 3 

Intra and interobserver variability 

EDV 
ESV 
SV 
EF 
LVM 



Intraobserver variability 



Mean difference ± SD, absolute 
0 ± 4 ml 
1 ± 10 ml 
1 ± 8 ml 
1 ± 6% 
1 ± 3 g 


Mean difference ± SD, relative 
1 ± 5% 
1 ± 5% 
1 ± 6% 
1 ± 4% of EF 
1 ± 5% 


Coefficient of variance 
4% 
10% 
8% 
6% 
3% 


Coefficient of repeatability 
8 ml 
20 ml 
16 ml 
12% 
6 g 


R^{2} 
0.96 
0.87 
0.85 
0.47 
0.97 


Intraclass correlation coefficient 
0.99 
0.96 
0.96 
0.81 
0.99 




Interobserver variability 



Mean difference ± SD, absolute 
3 ± 4 ml 
5 ± 14 ml 
8 ± 7 ml 
4 ± 6% 
1 ± 5 g 


Mean difference ± SD, relative 
5 ± 6% 
2 ± 6% 
6 ± 6% 
3 ± 4% of EF 
2 ± 9% 


Coefficient of variance 
4% 
12% 
7% 
7% 
6% 


Coefficient of repeatability 
8 ml 
28 ml 
14 ml 
12% 
10 g 


R^{2} 
0.96 
0.85 
0.82 
0.44 
0.91 


Intraclass correlation coefficient 
0.98 
0.95 
0.91 
0.81 
0.98 


Cain et al. BMC Medical Imaging 2009 9:2 doi:10.1186/1471234292 