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Table 1 Number of screening examinations and mean measures

From: Influence of breast compression pressure on the performance of population-based mammography screening

  Total Group 1
≤ 7.7 kPa
Group 2
7.7–9.3 kPa
Group 3
9.3–10.8 kPa
Group 4
10.8–13.0 kPa
Group 5
> 13.0 kPa
Number of examinations 132,776 26,490 26,617 26,539 26,549 26,581
Mean breast volume (cm3) 974 1511 1135 928 755 540
Mean percent dense volume (%) 7.8 5.7 6.6 7.5 8.4 10.7
Mean force (N) 125.9 112.6 121.5 125.9 130.7 138.9
Mean pressure (kPa) 10.5 6.6 8.5 10.0 11.8 15.6
  1. Thresholds to form the groups were applied at 7.7 kPa, 9.3 kPa, 10.8 kPa, and 13 kPa
  2. An examination with a pressure measurement equal to the threshold was assigned to the lower group