Table 3 Naturally decreasing trend in mean percent volumetric density by age group and density grade.

From: Mammographic Density Distribution of Healthy Taiwanese Women and its Naturally Decreasing Trend with Age

Age (y)

Mean VPD (%)

Cumulative Decrease in VPD (%)

VDG

a

b

c

d

a

b

c

d

35–39

2.95

5.76

11.82

23.02

—

—

—

—

40–44

3.07

5.93

11.76

22.89

−4.07

−2.95

0.51

0.56

45–49

3.19

6.04

11.59

22.16

−8.14

−4.86

1.95

3.74

50–54

3.17

6.06

11.16

21.31

−7.46

−5.21

5.58

7.43

55–59

3.13

5.98

10.80

20.38

−6.10

−3.82

8.63

11.47

60–64

3.20

5.95

10.47

20.11

−8.47

−3.3

11.42

12.64

65–69

3.20

5.86

10.35

19.96

−8.47

−1.74

12.44

13.29

  1. This table focuses on the decreasing trend in the mean percent volumetric density in healthy women by age for each mammographic density grade from 35 to 69 years; each age group represents a 5-year interval. The mammographic density grade was estimated in VDG by VolparaTM.
  2. VPD: percent volumetric density.
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