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Table 3 Summary of reproducibility testing

From: Quantification of left ventricular trabeculae using fractal analysis

Method†

Intra-observer κ

Inter-observer κ

Intra-observer ICC

Inter-observer ICC

 

κ

95% CI

κ

95% CI

ICC

95% CI

ICC

95% CI

  

LL

UL

LL

UL

LL

UL

LL

UL

Max. Apical FD

0.9***

0.7

1.2

0.9***

0.7

1.2

0.97

0.95

0.98

0.96

0.93

0.97

Global LV FD

0.9***

0.6

1.2

0.9***

0.6

1.1

0.98

0.97

0.99

0.97

0.95

0.98

Perimetry

0.9***

0.6

1.2

0.9***

0.7

1.3

0.98

0.97

0.99

0.98

0.96

0.99

Petersen

0.8**

0.5

1.0

0.7**

0.4

0.9

0.89

0.82

0.93

0.83

0.73

0.89

Jacquier

0.5*

0.2

0.8

0.5*

0.3

0.9

0.86

0.87

0.95

0.89

0.82

0.93

  1. *** Excellent agreement between ratings, κ of > 0.8.
  2. ** Strong agreement, κ of 0.61 – 0.8.
  3. * Moderate agreement, κ of 0.41 – 0.6.
  4. † For maximal apical FD, global LV FD and perimetry, cut-off values for LVNC diagnoses were derived from ROC analysis. For Petersen and Jacquier techniques, cut-off values for LVNC diagnoses were derived from previously published thresholds.
  5. ICC = intraclass correlation coefficient; κ = Fleiss’ kappa; ROC = receiver operating characteristics; other abbreviations as in Tables 1 and 2.