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Digital Mammography Example Dataset Documenation

This dataset includes 20,000 digital and 20,000 film screening mammograms performed between January 2005 and December 2008 from women included in the Breast Cancer Surveillance Consortium. Some women contribute more than one examination to the dataset. These data are recommended for use in teaching data analysis or epidemiological concepts. Because they represent only a small sample of mammography data available from BCSC they should not be used to conduct primary research. Researchers interested in conducting analyses of digital mammography performance can submit a proposal to the BCSC to gain access to a more complete sample of BCSC data (see Submitting a Proposal & Working with the BCSC).

Variable Name Description Coding
age_c patient's age in years at time of mammogram Numerical
assess_c Radiologist's assessment based on the BI-RADS scale 0 = Needs additional imaging
1 = Negative
2 = Benign finding(s)
3 = Probably benign
4 = Suspicious abnormality
5 = Highly suggestive of malignancy
cancer_c binary indicator of cancer diagnosis within one year of screening mammogram 0 = no cancer diagnosis
1 = cancer diagnosis
compfilm_c comparison mammogram from prior mammography examination available 0 = no
1 = yes
9 = missing
density_c patient's BI-RADS breast density as recorded at time of mammogram 1 = Almost entirely fatty
2 = Scattered fibroglandular densities
3 = Heterogeneously dense
4 = Extremely dense
famhx_c family history of breast cancer in a first degree relative 0 = no
1 = yes
9 = missing
hrt_c current use of hormone therapy at time of mammogram 0 = no
1 = yes
9 = missing
prvmam_c binary indicator of whether the woman had ever received a prior mammogram 0 = no
1 = yes
9 = missing
biophx_c history of breast biopsy 0 = no
1 = yes
9 = missing
mammtype film or digital mammogram 1 = film mammogram
2 = digital mammogram
CaTypeO cancer type 1 = ductal carcinoma in situ
2 = invasive cancer
8 = no cancer diagnosis
bmi_c body mass index at time of mammogram Numerical or -99 if missing
ptid patient's study id

The following source must be cited when using this dataset:

"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/."

Information about receiving data from the BCSC may also be included in the methods section using language such as:

"Data for this study was obtained from the BCSC Data Resource. More information regarding this resource is available at: http://breastscreening.cancer.gov/."