Appendix Table 5.

Estimated Frequency of Reference Consensus for Randomly Selected Cases From the U.S. Mammography Screening Population Aged 50-59 y With 1 Slide Interpreted by a Single Pathologist^*

Pathologist Interpretation	Reference Diagnosis, %				Total, %
	Benign	Atypia	DCIS	Invasive Breast Cancer
Benign	97.0	2.1	0.6	0.2	100
Atypia	53.6	37.7	8.7	0	100
DCIS	9.6	9.1	69.4	11.9	100
Invasive breast cancer	1.5	0.1	0.6	97.7	100

DCIS = ductal carcinoma in situ.

^*Values are the probabilities from Table 1 presented as percentages. These calculations can be applied to other populations by substituting the appropriate population prevalence estimates in the bottom row of Appendix Table 3.