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BCSC Mammography Data

Distribution of Number of Screening Mammograms per Woman for 1996-2009

Pie chart illustrating the distribution of the number of screening mammograms per woman for 1996-2009[D]

One strength of the BCSC data is the ability to follow women longitudinally. This figure shows the number of screening mammograms per woman in the current data from 1996-2009. While approximately 35% of the women have had only a single screening mammogram, it should not be interpreted that these women have had only one mammogram in fourteen years. They may not be included in all years or may have had mammography at a facility that was not included in the BCSC. However, for women with multiple exams in the BCSC, we can begin to explore the effect of multiple mammograms on the performance of screening mammography.

Distribution of Mammograms in 1996-2009 by Race/Ethnicity

Pie chart illustrating the distribution of mammograms in 1996-2009 by race/ethnicity [D]

This figure shows the racial distribution of 8,694,077 mammograms recorded in the Breast Cancer Surveillance Consortium for the years 1996-2009 inclusive. The BCSC standardized questions for race and ethnicity are asked in a similar manner as those on both the 2000 and 2010 census to allow comparisons to census data. The large number of unknowns reflects both the sensitivity of the question (some women prefer not to answer the question) and that not all radiology facilities ask about race.

Distribution of U.S. Women in 2000 by Race/Ethnicity

Pie chart titled: Distribution of US Women in 2000 by Race/Ethnicity[D]

This figure shows the racial distribution of approximately 139 million women in the US from the 2000 Census. The BCSC racial/ethnic distribution is similar to the 2000 data.

Number of Mammograms in 1996-2009 by Age & Year

Bar graph illustrating the number of mammograms in 1996-2009 by age & year[D]

This figure shows the number of screening and diagnostic mammograms recorded in the BCSC data for the years 1996-2009 inclusive. There were 402,888 in 1996; 534,302 in 1997; 672,776 in 1998; 689,041 in 1999; 702,574 in 2000; 716,595 in 2001; 753,833 in 2002; 727,849 in 2003; 714,937 in 2004; 595,795 in 2005; 526,580 in 2006; 547,521 in 2007; 551,862 in 2008; and 557,524 in 2009. These data suggest that mammography is occurring commonly in women aged 40 to 59.

Interval in Days Between Screening Mammograms (1996-2009) Performed 9 to 17 Months Apart

Bar graph illustrating the interval in days between screening mammograms (1996-2009) performed 9 to 17 months apart[D]

For women with two or more screening mammograms that are 9 to 17 months apart, we computed the lag time in days between these screening mammograms. The mode is actually 366 days. The peaks occur every seven days because women often come back on the same day of the week as their earlier mammogram. The distribution of lag time is important for the definition of sensitivity.

Months since Previous Mammogram

Bar graph titled: Months since Previous Mammogram[D]

From Yankaskas et al. Association between mammography timing and measures of screening performance in the United States. Radiology 2005 Feb; 234(2):363-73.

Sensitivity by Months of Follow-Up and by Initial Versus Work-Up Assessment

Line graph titled: Sensitivity by Months of Follow-Up and by Initial Versus Work-Up Assessment[D]


The following source must be cited when reproducing these data:

"Data collection and sharing was supported by the National Cancer Institute-funded Breast Cancer Surveillance Consortium (HHSN261201100031C). A list of the BCSC investigators and procedures for requesting BCSC data for research purposes are provided at: http://breastscreening.cancer.gov/."