Table 2

Intra-rater and inter-rater agreement for items relating to the radius and ulna

Categories and items

Radius

Ulna

Intra-rater agreement

Inter-rater agreement

Intra-rater agreement

Inter-rater agreement

ICC

95% CI

ICC

95% CI

ICC

95% CI

ICC

95% CI

Epiphysis

Bone marrow oedema

 Extent

0.86

0.72 to 0.94

0.78

0.66 to 0.88

0.74

0.53 to 0.87

0.30

0.15 to 0.50

 Location

0.60

0.32 to 0.79

0.60

0.43 to 0.75

0.69

0.44 to 0.84

0.26

0.11 to 0.45

 Signal intensity

0.85

0.69 to 0.93

0.76

0.63 to 0.86

0.59

0.30 to 0.78

0.27

0.12 to 0.47

 Visibility on 3D WATSc

0.90

0.79 to 0.95

0.70

0.55 to 0.83

0.28

0 to 0.57

0.34

0.18 to 0.54

Physis

Thickness*

0.80

0.62 to 0.90

0.47

0.35 to 0.59

0.44

0.09 to 0.69

0.22

0.10 to 0.34

 Location of thickness

0

0 to 0.45

0.07

0 to 0.24

0

NA

0

0 to 0.14

 Thickness compared with proximal physis of MC-1

0.83

0.67 to 0.91

0.58

0.42 to 0.73

0.52

0.19 to 0.74

0.21

0.07 to 0.40

Signal intensity

0.81

0.65 to 0.90

0.62

0.47 to 0.76

0.62

0.35 to 0.80

0.39

0.23 to 0.58

Disruptions

0.36

0 to 0.64

0.23

0.08 to 0.43

0.23

0 to 0.52

0.25

0.10 to 0.45

 Width of disruptions

0.39

0.02 to 0.66

0.26

0.11 to 0.45

0.42

0.09 to 0.67

0.26

0.11 to 0.46

Physeal border on epiphyseal side*

0.67

0.40 to 0.83

0.35

0.23 to 0.47

0.67

0.42 to 0.83

0.20

0.08 to 0.32

 Depth of irregularities

0

0 to 0.36

0

0 to 0.15

0

0 to 0.36

0 to 0.13

Metaphysis

Physeal border on metaphyseal side

0.84

0.69 to 0.92

0.60

0.43 to 0.75

0.58

0.28 to 0.78

0.43

0.27 to 0.61

Metaphyseal intrusions*

0.85

0.71 to 0.93

0.59

0.47 to 0.71

0.71

0.46 to 0.86

0.57

0.44 to 0.69

 Signal intensity intrusions

0.75

0.53 to 0.87

0

0 to 0.15

0.73

0.46 to 0.87

0

0 to 0.15

 Connection of intrusion with physis

0.85

0.71 to 0.93

0.41

0.24 to 0.60

0.56

0.25 to 0.77

0.43

0.26 to 0.62

 Depth of intrusions

0.91

0.82 to 0.96

0.69

0.54 to 0.82

0.67

0.36 to 0.84

0.54

0.38 to 0.71

Bone marrow oedema

 Presence*

0

0 to 0.36

0.32

0.21 to 0.44

0

NA

0.33

0.21 to 0.45

 Depth

0

0 to 0.36

0.36

0.20 to 0.56

0

NA

0.28

0.12 to 0.49

 Location

0

NA

0.34

0.18 to 0.53

0

NA

0.34

0.18 to 0.54

 Signal intensity

0.55

0.22 to 0.76

0.51

0.35 to 0.69

0.46

0.10 to 0.71

0.43

0.26 to 0.61

 Visibility on 3D WATSc

0.43

0.11 to 0.68

0.31

0.16 to 0.51

0.23

0 to 0.52

0.34

0.18 to 0.53

 Homogeneity

0

0 to 0.04

0.34

0.14 to 0.58

0

0 to 0.02

0.15

0.03 to 0.34

Shape

0

0 to 0.36

0.33

0.17 to 0.52

0

0 to 0.34

0.12

0.01 to 0.28

Location of widening

0

NA

0.10

0 to 0.28

0

0 to 0.35

0

0 to 0.14

Periosteal bone formation*

0

NA

0.26

0.14 to 0.39

0

NA

0

0 to 0.09

Sclerosis*

0.23

0 to 0.54

0.08

0 to 0.22

0

NA

0

0 to 0.04

  • *Fleiss’ kappa is reported for dichotomous variables.

  • 3D WATSc, three-dimensional water-selective cartilage scan; ICC, intraclass correlation coefficient; MC-1, first metacarpal bone; NA, not available (due to zero variance).