Table 2 Average percent agreement for each of the 10 cases and cases above and below a 20% PI threshold.

From: AI improves accuracy, agreement and efficiency of pathologists for Ki67 assessments in breast cancer

Average percent agreement

Case

Ground truth (PI)

Tool (PI)

No aid (%)

With aid (%)

1

7.3

8.2

95.6

100.0

2

11.1

10.5

94.4

100.0

3

12.1

13.3

96.7

98.9

4

14.4

14.8

92.2

95.6

5

16.2

16.2

91.1

96.7

6

16.9

16.3

95.6

94.4

7

19.8

17.8

88.9*

86.7

8

23.7

22.0

76.7*

96.7

9

28.2

29.7

67.8*

100.0

10

27.8

33.9

56.7

97.8

1–7

 < 20%

82.4

96.0

8–10

 ≥ 20%

73.2*

98.1

  1. The * highlights situations where the consensus misaligns with the established ground truth—meaning pathologists agree on a PI score that's > 20%, but the actual score was < 20%. For example, in case 7, most raters agreed that the TMA had a PI above 20%, but the ground truth indicates it's below 20% PI.
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