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Table 3 Inter-observer agreement on the 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

  Reader 2
Reader 1 PI PII PIII PIV PV Total High/low-risk
PI 107
(227)
2
(4)
5
(11)
7
(22)
5
(24)
126
(288)
245; 64%
PII 20
(47)
81
(191)
4
(8)
0
(0)
0
(0)
105
(246)
(561; 73%)
PIII 6
(8)
2
(3)
5
(15)
1
(1)
0
(0)
14
(27)
 
PIV 26
(42)
0
(0)
0
(0)
76
(108)
17
(24)
119
(174)
139; 36%
PV 1
(1)
0
(0)
0
(0)
1
(0)
18
(29)
20
(30)
(204; 27%)
Total 160
(325)
85
(198)
14
(34)
85
(131)
40
(77)
384
(765)
P<0.0001
High/low-risk 259; 67%
(557; 73%)
  125; 33%
(208; 27%)
  
Agreement Women (%) Breasts (%)   
Absolute agreement: 74.7 74.5     
PI/PII disagreement: 5.7 6.7     
PI/PIII disagreement: 2.9 2.5     
PI/PIV disagreement: 8.6 8.4     
PI/PV disagreement: 1.6 3.3     
PII/PIII disagreement: 1.6 1.4     
PII/PIV disagreement: 0 0     
PII/PV disagreement: 0 0     
PIII/PIV disagreement: 0.3 0.1     
PIII/PV disagreement : 0 0     
PIV/PV disagreement : 4.7 3.1     
High/low-risk agreement : 89.6 88.2     
  1. Based on 384 women (breasts are shown in brackets; n=765).
  2. Numbers in boldface indicate agreement between the two readers.