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Table 3 Correlation analysis and limits of agreement (Bland-Altman analysis) between the echocardiographic methods and MPI 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 MPI 1.0 ± 14.0 0.77 0.4 ± 15.2 0.73   
BS vs MPI -0.3 ± 13.4 0.80 -3.6 ± 16.3 0.68   
AutoEF vs MPI      1.9 ± 16.9 0.67
EDV/BSA (mL/m2):       
cAutoEF vs MPI -14.1 ± 25.2 0.92 -13.1 ± 27.1 0.89   
BS vs MPI -10.8 ± 25.6 0.89 8.0 ± 30.9 0.80   
AutoEF vs MPI      -16.6 ± 28.5 0.87
ESV/BSA (mL/m2):       
cAutoEF vs MPI -8.7 ± 22.8 0.95 -7.9 ± 24.1 0.92   
BS vs MPI -6.2 ± 21.6 0.93 6.0 ± 23.4 0.87   
AutoEF vs MPI      -10.4 ± 25.8 0.90
  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 MPI = myocardial perfusion imaging