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Table 3 Comparison of automatic and manual measurements of arotic annulus diameter

From: Automatic measurement of aortic annulus diameter in 3-dimensional Transoesophageal echocardiography

  Bias Intraclass correlation
Sagittal   
D 1 versus D 2 0.063 ± 1.5 0.88
Coronal   
D 1 versus D 2 0.063 ± 2.4 0.74
Perimeter-derived   
D a u t o versus D 1 -0.35 ± 1.6 0.87
D a u t o versus D 2 -0.23 ± 2.3 0.75
D 1 versus D 2 0.12 ± 2.1 0.78
Area-derived   
D a u t o versus D 1 0.62 ± 1.7 0.85
D a u t o versus D 2 0.46 ± 2.3 0.74
D 1 versus D 2 -0.16 ± 2.1 0.77
  1. Biases are mean ±SD [mm]. D auto, D 1 and D 2 denote automatic and manual measurements from the the first and second observer respectively.