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Cancer Rate (per 1,000 examinations) and Cancer Detection Rate (per 1,000 examinations) for 3,603,832 Screening Mammography Examinations from 1996 to 2006 by Age

  Number of screening
mammography examinations1 		Number of cancers2 Cancer rate
(per 1,000 examinations)3 		Cancer detection rate
(per 1,000 examinations)4
Total 3,603,832 17,529 4.86 3.90
Age 40-49 493,794 1,131 2.29 1.62
Age 45-49 584,268 1,938 3.31 2.46
Age 50-54 632,728 2,525 3.99 3.13
Age 55-59 509,175 2,575 5.05 4.13
Age 60-64 393,587 2,276 5.78 4.62
Age 65-69 339,245 2,094 6.17 5.09
Age 70-74 292,409 2,075 7.09 5.88
Age 75-89 358,626 2,915 8.12 6.87

1 Screening mammography examination: Mammography examinations indicated by the radiogist to be for screening with bilateral views done and no other mammogram within the past 9 months among women without breast implants or a prior breast cancer diagnosis.

2 Cancers = The number of examinations with a tissue diagnosis of ductal carcinoma in situ or invasive cancer within 1 year following the examination and before the next screening mammography examination.

3 Cancer rate (per 1,000 examinations) = The number of cancers among 1,000 screening mammography examinations.

4 Cancer detection rate (per 1,000 examinations) = The number of cancers among 1,000 screening mammography examinations with a positive interpretation (BI-RADS category 0, 3 with a recommendation for immediate follow-up, 4, or 5).

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Last modified: 20 Nov 2008
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