All responders (*n*) | 209 | 140 (67%) | 24 (12%) | 45 (22%) | — |

Age (*n*) | | | | | |

<55 y | 68 | 36 (53%) | 14 (21%) | 18 (27%) | 0.003 |

≥55 y | 141 | 104 (74%) | 10 (7%) | 27 (19%) | |

Mean ± SD (y) | 209 | 61.5 ± 10.4 | 54.7 ± 10.1 | 58.7 ± 10.2 | 0.008 |

BMI (*n*) | | | | | |

<25 kg/m^{2} | 104 | 63 (61%) | 15 (14%) | 26 (25%) | 0.19 |

25 to <30 kg/m^{2} | 62 | 41 (66%) | 5 (8%) | 16 (26%) | |

≥30 kg/m^{2} | 32 | 26 (81%) | 3 (9%) | 3 (9%) | |

Mean ± SD (kg/m^{2}) | 196 | 26.1 ± 4.9 | 24.7 ± 5.5 | 24.5 ± 3.8 | 0.14 |

Compressed breast thickness on MBI, craniocaudal view (*n*) | | | | | |

<4 cm | 19 | 11 (58%) | 3 (16%) | 5 (26%) | 0.72 |

4–8 cm | 176 | 121 (69%) | 19 (11%) | 36 (21%) | |

>8 cm | 13 | 8 (62%) | 1 (8%) | 4 (31%) | |

Mean ± SD (cm) | 208 | 6.1 ± 1.4 | 5.5 ± 1.8 | 5.7 ± 1.5 | 0.11 |

Reported preexisting pain (*n*) | | | | | 0.66 |

No | 192 | 130 (68%) | 21 (11%) | 41 (21%) | |

Yes | 17 | 10 (59%) | 3 (18%) | 4 (24%) | |

MBI history (*n*) | | | | | 0.006 |

At least 1 prior MBI | 133 | 94 (71%) | 19 (14%) | 20 (15%) | |

First-time MBI | 76 | 46 (61%) | 5 (7%) | 25 (33%) | |