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


R2

0.96

0.87

0.85

0.47

0.97


Intra-class 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


R2

0.96

0.85

0.82

0.44

0.91


Intra-class correlation coefficient

0.98

0.95

0.91

0.81

0.98


Cain et al. BMC Medical Imaging 2009 9:2   doi:10.1186/1471-2342-9-2

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