TABLE 1.

Comparative Patient and Imaging Characteristics for Positive Findings Interpreted by the Same Radiologist or Different Radiologists

	Total		One Radiologist		Two Radiologists
Characteristic	No.	%	No.	%	No.	%
Total	6,391		2,335	36.5	4,056	63.5
Age (y)
40–44	908	14.2	295	12.6	613	15.1
45–49	1,026	16.1	387	16.6	639	15.8
50–54	1,033	16.2	379	16.2	654	16.1
55–59	853	13.4	325	13.9	528	13.0
60–64	728	11.4	277	11.9	451	11.1
65–69	633	9.9	238	10.2	395	9.7
70+	1,210	18.9	434	18.6	776	19.1
Breast density
Extremely dense	355	5.6	140	6.0	215	5.3
Heterogeneously dense	2,474	38.7	889	38.1	1,585	39.1
Scattered fibroglandular densities	3,002	47.0	1,101	47.2	1,901	46.9
Almost entirely fat	183	2.9	73	3	110	2.7
Missing information	377	5.9	132	5.7	245	6.0
Time since last mammograma
No previous mammogram	854	13.4	311	13.9	543	13.4
1–35 mo	4,197	65.7	1,535	68.7	2,662	65.5
36 mo	909	14.2	329	14.7	580	14.3
Family history of breast cancer in first-degree relative
Yes	719	11.3	258	11.1	461	11.4
No	5,672	88.8	2,077	89.0	3,595	88.6
Self-reported breast problem
Yes	265	4.2	99	4.2	166	4.1
No	6,126	95.9	2,236	95.8	3,890	95.9
History of breast procedure
Yes	1,802	28.2	640	27.4	1,162	28.7
No	4,589	71.8	1,695	72.6	2,894	71.4
Workup included ultrasound
Yes	2,496	39.1	907	38.8	1,589	39.2
No	3,895	61.0	1,428	61.2	2,467	60.8

^a431 variables from the total had missing data.