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Table 2 Kappa (κ)-statistics according to the BI-RADS and Tabár classification

From: Inter-observer agreement according to three methods of evaluating mammographic density and parenchymal pattern in a case control study: impact on relative risk of breast cancer

  Agreement
absolute (%)
Total
κ (95% CI)
Cases
κ (95% CI)
Controls
κ (95% CI)
Left
κ (95% CI)
Right
κ (95% CI)
Total
ICC* (95% CI)
Breasts n=765 n=765 n=242 n=523 n=383 n=382 n=765
BI-RADS        
4-categories 77.6 0.68
(0.64-0.72)
0.65
(0.57-0.73)
0.69
(0.64-0.74)
0.71
(0.66-0.77)
0.65
(0.59-0.71)
0.88
(0.81-0.92)
Low/high-risk 88.9 0.74
(0.68-0.79)
0.75
(0.66-0.83)
0.72
(0.65-0.78)
0.74
(0.66-0.81)
0.75
(0.67-0.82)
-
Tabár        
5-categories 74.5 0.64
(0.60-0.69)
0.56
(0.47-0.63)
0.67
(0.62-0.72)
0.70
(0.64-0.75)
0.59
(0.53-0.65)
-
Low/high-risk 88.2 0.70
(0.63-0.80)
0.72
(0.63-0.80)
0.67
(0.58-0.75)
0.75
(0.69-0.82)
0.65
(0.55-0.73)
-
Women n=384 n=384 n=122 n=262    n=384
BI-RADS        
4-categories 77.3 0.68
(0.63-0.74)
0.60
(0.49-0.71)
0.72
(0.65-0.78)
   0.89
(0.79-0.93)
Low/high-risk 87.5 0.73
(0.66-0.79)
0.69
(0.57-0.81)
0.73
(0.63-0.81)
   -
Tabár        
5-categories 74.7 0.65
(0.59-0.71)
0.55
(0.44-0.67)
0.69
(0.61-0.75)
   -
Low/high-risk 89.6 0.77
(0.70-0.84)
0.80
(0.69-0.90)
0.73
(0.63-0.83)
   -
  1. Kappa values are based on 765 breasts and 384 women, respectively.
  2. *ICC (two-way random, single measure) corresponding to the weighted kappa value.