MMWR: Vital Signs: Breast Cancer Screening Among Women Aged 50--74 Years --- United States, 2008

Every 2 years, CDC uses Behavioral Risk Factor Surveillance System data to estimate mammography prevalence in the United States. Up-to-date mammography prevalence is calculated for women aged 50--74 years who report they had the test in the preceding 2 years.

http://www.cdc.gov/mmwr/preview/mmwrhtml/mm59e0706a2.htm?s_cid=mm59e0706...