TABLE 4.

Summary of Area Under the Curve (AUC) Values by Experience Variables for 35 Observers Without Feedback and With Feedback After Each of 70 Breast Ultrasound Cases

	Without Feedback		With Feedback
Characteristic	AUC	CI	AUC	CI
Across all demographics	0.813	0.797 to 0.829	0.840	0.825 to 0.854
Ability to fill out forms
Obsessive compulsive	0.817	0.799 to 0.835	0.844	0.828 to 0.861
My research associate does everything	0.803	0.775 to 0.832	0.832	0.807 to 0.857
Don’t count on it	0.810	0.764 to 0.856	0.831	0.789 to 0.872
Years in breast imaging
< 2 years	0.763	0.701 to 0.826	0.797	0.741 to 0.853
2–5 years	0.799	0.769 to 0.829	0.834	0.808 to 0.860
6–10 years	0.840	0.807 to 0.872	0.862	0.833 to 0.891
> 10 years	0.816	0.797 to 0.836	0.841	0.823 to 0.859
% Time in clinical breast imaging
< 25	0.759	0.706 to 0.811	0.798	0.752 to 0.844
25–49	0. 811	0.765 to 0.857	0.828	0.786 to 0.869
50–74	0.809	0.776 to 0.842	0.848	0.819 to 0.876
75–100	0.821	0.803 to 0.839	0.845	0.829 to 0.861
Who routinely performs breast ultrasound?
Technologist	0.680	0.608 to 0.752	0.743	0.680 to 0.806
Myself	0.792	0.765 to 0.818	0.827	0.804 to 0.850
Resident then myself	0.793	0.745 to 0.840	0.808	0.764 to 0.852
Technologist then myself	0.836	0.816 to 0.856	0.857	0.839 to 0.875
Fellow then myself	0.867	0.835 to 0.899	0.885	0.856 to 0.913
No. of mammograms per week
0–99	0.772	0.732 to 0.812	0.822	0.788 to 0.855
100–149	0.805	0.774 to 0.836	0.840	0.813 to 0.867
150–199	0.819	0.794 to 0.843	0.843	0.821 to 0.865
200–299	0.841	0.817 to 0.864	0.853	0.830 to 0.875
300–399	0.727	0.632 to 0.821	0.739	0.650 to 0.828
400–499	0.812	0.734 to 0.890	0.873	0.815 to 0.932
No. of breast ultrasound per week
< 20	0.796	0.755 to 0.838	0.828	0.791 to 0.864
21–39	0.798	0.775 to 0.821	0.828	0.808 to 0.849
40–69	0.830	0.810 to 0.851	0.854	0.836 to 0.872
Whole-breast ultrasound
Never	0.804	0.775 to 0.834	0.829	0.803 to 0.856
In patients with new cancer	0.850	0.826 to 0.874	0.860	0.838 to 0.883
Diagnostic and screening	0.798	0.777 to 0.819	0.834	0.816 to 0.853