BCSC Mammography Data

Mammograms by Race/Ethnicity, 1996-2016

Race/Ethnicity Percentage of Mammograms Percentage of US Women
1: White, non-Hispanic 73.2% 67.0%
2: Black, non-Hispanic 10.8% 12.2%
3: Asian or Pacific Islander 9.2% 5.2%
5: American Indian or Alaska Native 0.3% 0.7%
6: Other or Mixed (2+ races) 1.6% 1.3%
8: Hispanic 4.8% 13.7%


This table shows the racial/ethnic distribution of 11,220,288 mammograms recorded in 1996-2016 from the 6 active BCSC sites. The BCSC’s standardized questions for race and ethnicity were asked in a similar manner as on the US census in 2000 and 2010.  

The racial/ethnic distribution among 120.7 million US women age 18+ years in 2010 is shown for comparison. 

Note: The numbers in the table at the left exclude N=781,937 mamograms with missing race. This large number of missing values reflects that some women prefer not to answer the question and some radiology facilities did not ask about race.

Number of Screening Mammograms per Woman, 1996-2016

SAS Output
Histogram showing the Number of Screening Mammograms per Woman 1 2 3 4 5 or more Screening mammograms 0% 10% 20% 30% 40% Percent



One strength of the BCSC is the ability to follow women longitudinally. This figure shows the number of screening mammograms per woman in the 6 active BCSC sites in 1996-2016. While approximately 28% of the women have only one screening mammogram in BCSC data, it should not be interpreted that these women had only one mammogram in twenty years. The woman may have had a mammogram at a facility that was not in the BCSC. For women with multiple exams in the BCSC, we can examine patterns and screening performance over time. 

Volume of Film, Digital, and 3D Mammograms in the BCSC by Year, 1996-2016

SAS Output
Type of mammogram by year 1996 2000 2004 2008 2012 2016 Year 0% 20% 40% 60% 80% 100% Percent Tomosynthesis Digital Film Type of mammogram




The BCSC data reflect the large changes over time in the types of mammograms used in U.S. community practice. Until the early 2000s almost all mammograms were film. Then digital mammograms became common, followed in recent years by the growth in 3D mammography (also known as tomosynthesis). Film mammography has all but disappeared.

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The following must be cited when reproducing this data:

"The Breast Cancer Surveillance Consortium and its data collection and sharing activities are funded by grants from the National Cancer Institute (P01CA154292, U54CA163303), Patient-Centered Outcomes Research Institute (PCS-1504-30370), and Agency for Health Research and Quality (R01 HS018366-01A1). Downloaded xx/xx/xxxx from the Breast Cancer Surveillance Consortium Web site - http://www.bcsc-research.org/. More information regarding the BCSC is available at: http://bcsc-research.org/."