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Table 3 Location of the points of highest density within the breast, by level of overall PD

From: The spatial distribution of radiodense breast tissue: a longitudinal study

Overall PD value at left exit MLO screen Number of women Proportion of highest-density points located in highest-density regionsa Mean entry-exit change in the location of the point of highest densityb
All 165 0.9 (0.9, 0.9) 1.3 (1.2, 1.5)
< 20% 41 1.0 (0.9, 1.0) 1.4 (1.1, 1.7)
20 to 39% 43 1.0 (0.9, 1.0) 1.0 (0.7, 1.3)
40 to 59% 38c 0.9 (0.8, 1.0) 1.3 (1.0, 1.6)
60 to 79% 38 0.8 (0.7, 0.9) 1.6 (1.3, 1.9)
≥ 80% 5 0.8 (0.3,1.2) 2.4 (1.7, 3.1)
P valued   < 0.01 < 0.01
  1. aThe highest-density regions in each woman were those in the top quarter of her distribution of regional percent density (PD) values at the left exit medio-lateral oblique (MLO) screen. bExpressed as the mean number of regions between the points of highest density between the entry and exit left MLO screens (see Methods) and accounting for clustering within women. cOnly 37 women in the change in location analysis. dWald's test.