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Table 4 Number of screens needed (NSN) for one additional mammography-only detected cancer

From: The added value of mammography in different age-groups of women with and without BRCA mutation screened with breast MRI

  Age group (years) Number of breast cancers Number of screens Breast cancers detected by mammography only NSN for mammography to detect breast cancer missed by MRI
Overall < 40 years 26 1829 1 1829
  40–50 years 32 2050 2 1025
  50–60 years 45 1833 8 229
  ≥ 60 years 22 841 2 421
 BRCA < 40 years 17 1113 0 N/A
  40–50 years 14 737 0 N/A
  50–60 years 26 568 3 189
  ≥ 60 years 4 190 0 N/A
 No BRCA < 40 years 9 716 1 716
  40–50 years 18 1313 2 657
  50–60 years 19 1265 5 253
  ≥ 60 years 18 651 2 326
Follow up < 40 years 17 1112 1 1112
  40–50 years 20 1447 2 724
  50–60 years 28 1342 8 168
  ≥ 60 years 11 626 2 313
 BRCA < 40 years 12 725 0 N/A
  40–50 years 9 554 0 N/A
  50–60 years 18 433 3 144
  ≥ 60 years 0 152 0 N/A
 No BRCA < 40 years 5 387 1 387
  40–50 years 11 893 2 447
  50–60 years 10 909 5 182
  ≥ 60 years 11 474 2 237
  1. MRI magnetic resonance imaging, N/A not applicable, the first round was not shown in the table as no mammography-only cancers were detected in the first round