Prior mammogram Result/recommendation | Number breast cancer cases | P-Y at risk | Breast cancer rate (95% CI) per 1,000 P-Y |
---|---|---|---|

All women | |||

True-negative | 43,105 | 11,034,496 | 3.91 (3.87–3.94) |

False-positive, additional imaging | 4,742 | 861,365 | 5.51 (5.35–5.66) |

False-positive, biopsy | 888 | 126,699 | 7.01 (6.56–7.48) |

By BI-RADS breast density | |||

Almost entirely fat | |||

True-negative | 2,206 | 993,559 | 2.22 (2.13–2.31) |

False-positive, additional imaging | 123 | 33,291 | 3.69 (3.07–4.41) |

False-positive, biopsy | 23 | 5,774 | 3.98 (2.53–5.97) |

Scattered fibroglandular density | |||

True-negative | 17,884 | 5,070,911 | 3.53 (3.37–3.47) |

False-positive, additional imaging | 1,737 | 355,192 | 4.89 (4.51–4.95) |

False-positive, biopsy | 315 | 52,612 | 5.99 (5.09–6.36) |

Heterogeneously dense | |||

True-negative | 19,014 | 4,143,830 | 4.59 (4.52–4.65) |

False-positive, additional imaging | 2,372 | 398,280 | 5.96 (5.72–6.20) |

False-positive, biopsy | 448 | 56,984 | 7.86 (7.15–8.62) |

Extremely dense | |||

True-negative | 4,001 | 826,197 | 4.84 (4.69–4.99) |

False-positive, additional imaging | 510 | 74,602 | 6.84 (6.26–7.45) |

False-positive, biopsy | 102 | 11,329 | 9.00 (7.35–10.92) |