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Table 4 Inter-observer variance

From: Non-contrast MR angiography at 1.5 Tesla for aortic monitoring in Marfan patients after aortic root surgery

 

Inter-observer variance

 

Mid-Graft

Distal anastomosis

Ascending aorta

Aortic arch

Descending aorta

Diaphragm

Celiac trunk

 

2D SSFP

Mean difference (mm)

2.08

0.08

1.17

0.10

1.97

1.10

0.79

Limits of agreement (mm)

−4.45 to 8.61

−4.43 to 4.59

−4.87 to 7.20

−5.04 to 5.24

−4.10 to 8.03

−6.34 to 8.55

−8.64 to 10.21

Standard deviation (mm)

3.33

2.30

3.1

2.62

3.10

3.80

4.81

Variance (mm2)

11.1

5.29

9.47

6.87

9.59

14.43

23.13

ICC

0.69

0.83

0.86

0.90

0.95

0.89

0.85

 

3D CE-CMRA

Mean difference (mm)

2.34

1.38

1.44

0.41

2.69

1.62

0.95

Limits of agreement (mm)

−4.8 to 9.56

−5.72 to 8.47

−3.54 to 6.43

−5.68 to 6.49

−9.31 to 14.70

−5.39 to 8.62

−4.34 to 6.25

Standard deviation (mm)

3.68

3.62

2.54

3.10

6.13

3.57

2.70

Variance (mm2)

13.57

13.11

6.47

9.63

37.53

12.77

7.29

ICC

0.48

0.68

0.84

0.78

0.75

0.87

0.88

p-value (t test)

0.543

0.023

0.385

0.549

0.350

0.064

0.069

p-value (F test)

0.443

0.001

0.440

0.220

<0.001

0.641

<0.001

  1. Inter-observer variance of measured aortic diameters as determined by non-contrast 2D bSSFP imaging and 3D CE-CMRA as described by Bland and Altman. Intraclass correlation coefficients (ICC) are given for both sequence types. Paired t-test was performed for comparison of mean differences and F test for comparison of variances. Significant differences are in bold (significant at p < .05)