Table 1.

Characteristics of patient populations of 486 BCSC radiologists^* contributing normative screening mammography data

Patient characteristics	Average percentage	Range of percentages across BCSC radiologists
First mammograms	5%	0% – 12%
Annual mammograms†	65%	21% – 90%
Biennial mammograms§	18%	5% – 67%
Age <50 years	32%	12% – 68%
White, non-Hispanic	76%	0% – 99%
Black, non-Hispanic	6%	0% – 53%
Hispanic	8%	<1% – 78%
Asian	8%	1% – 99%
Family history of breast cancer	15%	4% – 23%

BCSC, Breast Cancer Surveillance Consortium.

^*Restricted to radiologists with <10% missing data for each patient characteristic.

^†Previous mammogram in the last 9–18 months.

^§Previous mammogram in the last 19–30 months.