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Cancer Rate (per 1,000 examinations) and Cancer Detection Rate (per 1,000 examinations) for 3,884,059 Screening Mammography Examinations from 1996 to 2007 by Age & Time (Months) Since Previous Mammography

Number of screening mammography examinations1 Number of cancers2 Cancer rate (per 1,000 examinations)3 Cancer detection rate (per 1,000 examinations)4
Age 40-44 534,324 1,260 2.35 1.69
9-15 months 184,237 409 2.21 1.43
16-20 months 61,173 127 2.07 1.40
21-27 months 78,065 170 2.17 1.56
28+ months 120,623 301 2.49 1.85
No previous mammography 90,226 253 2.80 2.33
Age 45-49 625,930 2,146 3.42 2.60
9-15 months 268,283 803 2.99 2.09
16-20 months 86,974 284 3.26 2.38
21-27 months 107,033 374 3.49 2.72
28+ months 134,787 541 4.01 3.27
No previous mammography 28,853 144 4.99 4.47
Age 50-54 677,991 2,755 4.06 3.23
9-15 months 354,043 1,268 3.58 2.66
16-20 months 100,268 379 3.77 2.90
21-27 months 98,481 377 3.82 3.25
28+ months 106,540 603 5.65 4.91
No previous mammography 18,659 128 6.85 6.21
Age 55-59 552,900 2,811 5.08 4.20
9-15 months 316,687 1,388 4.38 3.50
16-20 months 79,462 433 5.44 4.29
21-27 months 75,333 422 5.60 4.72
28+ months 71,257 453 6.35 5.72
No previous mammography 10,161 115 11.31 10.62
Age 60-64 426,096 2,477 5.81 4.70
9-15 months 253,696 1,270 5.00 3.81
16-20 months 58,068 322 5.54 4.49
21-27 months 55,625 371 6.66 5.59
28+ months 50,620 422 8.33 7.46
No previous mammography 8,087 92 11.37 10.51
Age 65-69 365,536 2,300 6.29 5.25
9-15 months 217,378 1,125 5.17 4.08
16-20 months 48,042 298 6.20 5.34
21-27 months 49,579 375 7.56 6.47
28+ months 42,364 388 9.15 8.28
No previous mammography 8,173 114 13.94 12.72
Age 70-74 313,809 2,227 7.09 5.95
9-15 months 184,765 1,110 6.00 4.79
16-20 months 39,453 270 6.84 5.67
21-27 months 46,800 378 8.07 7.20
28+ months 36,943 361 9.77 8.82
No previous mammography 5,848 108 18.46 16.58
Age 75-89 387,473 3,170 8.18 6.96
9-15 months 212,964 1,343 6.30 5.09
16-20 months 48,105 358 7.44 6.23
21-27 months 65,222 608 9.32 8.15
28+ months 53,432 653 12.22 11.04
No previous mammography 7,750 208 26.83 24.90

1 Screening mammography examination: Mammography examinations indicated by the radiogist to be for screening with bilateral views done and no other mammogram within the last 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: 26 Jun 2009
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