Table 1 Distribution of VDG/BI-RADS grades of healthy Taiwanese women by age group.

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

Age (y)

Proportion (%) of participants who underwent screening using VDG/BI-RADS density categories for each age group

Grade a

Grade b

Grade c

Grade d

<30

0.7% (2/272)

4.4% (12/272)

12.5% (34/272)

82.4% (224/272)

30–39

0.2% (7/3,378)

5.2% (177/3,378)

25.8% (873/3,378)

68.7% (2,321/3,378)

40–49

0.2% (43/25,447)

6.2% (1,581/25,447)

35.8% (9,119/25,447)

57.8% (14,704/25,447)

50–59

0.4% (132/36,162)

17.0% (6,158/36,162)

51.0% (18,449/36,162)

31.6% (11,423/36,162)

60–69

0.7% (156/21,636)

32.5% (7,023/21,636)

53.0% (11,467/21,636)

13.8 (2,990/21,636)

>70

0.7 (7/1,019)

34.9% (356/1,019)

54.5% (555/1,019)

9.9% (101/1,019)

Total

0.4% (347/88,193)

17.5% (15,399/88,193)

46.1% (40,654/88,193)

36.1% (31,794/88,193)

  1. The number of FFDM examinations in each age group is shown according to the density grade and its proportion of the total number in the group. The percentage (%) represents the proportion of the number of participants in each VDG/BI-RADS density category for each age group. The number of participants with a specified density is the numerator and the total number of participants in the specific age group is the denominator. The mammographic density grade was estimated in VDG by VolparaTM.
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