Table 3.
Summary statistics (n = 128 breasts) showing dependence on race for chest-wall to nipple length (CNL), pectoralis to nipple length (PNL), effective diameter of the breast at chest-wall (Deff), fibroglandular volume (Vg), total breast volume (TBV), and volumetric glandular fraction (VGF). While Deff includes the skin, Vg, TBV, and hence VGF exclude the skin and the areolar region. * indicates the two distributions for the corresponding measurement were significantly different at the 0.05 level (Mann-Whitney test).
| CNL* | PNL* | Deff | Vg | TBV* | VGF | |
|---|---|---|---|---|---|---|
| African American (n = 35 breasts) | ||||||
| Mean | 10.7 | 9.1 | 14.0 | 75.9 | 649.8 | 0.134 |
| Standard deviation | 2.5 | 2.6 | 2.7 | 66.0 | 385.3 | 0.101 |
| Minimum | 6.1 | 3.9 | 9.2 | 2.7 | 82.0 | 0.012 |
| Median | 11.0 | 9.6 | 14.3 | 56.2 | 688.2 | 0.121 |
| Maximum | 15.2 | 14.1 | 20.5 | 301.0 | 1870.4 | 0.414 |
| White (n = 93 breasts) | ||||||
| Mean | 8.9 | 7.0 | 13.1 | 56.4 | 380.7 | 0.192 |
| Standard deviation | 2.6 | 2.4 | 2.3 | 52.3 | 293.2 | 0.155 |
| Minimum | 3.4 | 2.3 | 8.2 | 2.1 | 35.5 | 0.015 |
| Median | 9.0 | 6.9 | 12.8 | 36.6 | 330.8 | 0.139 |
| Maximum | 14.9 | 13.8 | 18.5 | 277.9 | 1648.8 | 0.719 |