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Table 3 Intra- and interobserver variability

From: Age and gender specific normal values of left ventricular mass, volume and function for gradient echo magnetic resonance imaging: a cross sectional study

  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