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Table 2 Agreement (%) between academic readers and Veridex consensus (VC)

From: International study on inter-reader variability for circulating tumor cells in breast cancer

 

No CTC versus CTC

  

CTC HER2- versus CTC HER2+

 

RDs

N

Agreement (%)

Kappa statistic

Kappa agreement

N

Agreement (%)

Kappa statistic

Kappa agreement

A

267

91.8%

0.83

Almost perfect

155

81.3%

0.63

Substantial

B

267

91.4%

0.82

Almost perfect

155

81.3%

0.63

Substantial

C

267

92.5%

0.84

Almost perfect

155

90.3%

0.81

Almost perfect

D

267

91.8%

0.83

Almost perfect

155

71.6%

0.47

Moderate

E

266

95.1%

0.90

Almost perfect

154

93.5%

0.87

Almost perfect

F

267

92.1%

0.84

Almost perfect

155

87.1%

0.75

Substantial

G

267

91.4%

0.82

Almost perfect

155

91.0%

0.82

Almost perfect

H

267

91.4%

0.82

Almost perfect

155

88.4%

0.78

Substantial

I

267

92.1%

0.84

Almost perfect

155

91.6%

0.84

Almost perfect

J

267

83.9%

0.65

Substantial

155

76.8%

0.55

Moderate

K

220

87.3%

0.74

Substantial

117

79.5%

0.59

Moderate

L

266

92.9%

0.85

Almost perfect

154

94.8%

0.90

Almost perfect

M

220

87.3%

0.74

Substantial

117

90.6%

0.82

Almost perfect

N

267

95.9%

0.92

Almost perfect

155

92.3%

0.85

Almost perfect

O

267

96.6%

0.93

Almost perfect

155

92.9%

0.86

Almost perfect

P

267

94.4%

0.88

Almost perfect

155

85.2%

0.72

Substantial

Q

218

91.7%

0.83

Almost perfect

113

84.1%

0.69

Substantial

R

218

91.7%

0.83

Almost perfect

113

85.8%

0.73

Substantial

S

220

92.7%

0.85

Almost perfect

117

86.3%

0.73

Substantial

T

266

69.2%

0.37

Fair

154

51.3%

0.25

Fair

U

267

91.4%

0.82

Almost perfect

155

91.0%

0.82

Almost perfect

V

220

91.8%

0.84

Almost perfect

117

82.1%

0.66

Substantial

  1. CTC, circulating tumor cell; RDs, readers; N, number of images. Kappa Agreement, below 0.00 Poor; 0.00 to 0.20 Slight; 0.21 to 0.40 Fair; 0.41 to 0.60 Moderate; 0.61 to 0.80 Substantial; 0.81 to 1.00 Almost Perfect.