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Table 2 Correlation analysis and limits of agreement (Bland-Altman analysis) between the echocardiographic methods based upon the experience of the readers.

From: Computer-assisted determination of left ventricular endocardial borders reduces variability in the echocardiographic assessment of ejection fraction

  Expert (n = 5)   Novice (n = 2)   Expert (n = 1)  
  Limits of agreement r Limits of agreement r Limits of agreement r
LVEF (%):       
cAutoEF vs BS expert 1.4 ± 9.0 0.89 0.8 ± 10.5 0.85   
AutoEF vs BS expert      2.2 ± 12.1 0.81
BS novice vs BS expert    -3.2 ± 11.4 0.81   
cAutoEF novice vs expert    -0.6 ± 5.5 0.96   
EDV/BSA (mL/cm2):       
cAutoEF vs BS expert -3.3 ± 13.0 0.94 -2.3 ± 13.1 0.94   
AutoEF vs BS expert      -5.8 ± 14.4 0.86
BS novice vs BS expert    18.8 ± 22.1 0.87   
cAutoEF novice vs expert    1.0 ± 5.1 0.99   
ESV/BSA (mL/cm2):       
cAutoEF vs BS expert -2.6 ± 7.8 0.97 -1.8 ± 8.0 0.97   
AutoEF vs BS expert      -4.3 ± 9.3 0.95
BS novice vs BS expert    12.1 ± 12.4 0.93   
cAutoEF novice vs expert    0.8 ± 3.5 0.99   
  1. Limit of agreement is calculated as bias ± 1.96
  2. SD BS = manual biplane Simpson, BSA = body surface area, cAutoEF = corrected AutoEF, EDV = End-diastolic volume, ESV = End-systolic volume, LVEF = Left ventricular ejection fraction