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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.
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