Table 2 Age, BMI and breast density characteristics of the Caucasian and African-American study groups

Number of women

389

250

Age (Mean ± SD)

53.1 y ± 7.1

51.8 y ± 7.6

0.03*

Gail lifetime risk (Mean ± SD)

12.1% ± 4.8

8.6% ± 2.8

<0.001*

Body mass index (BMI)

<0.001*

   <25 kg/m²

197 (50.6%)

36 (14.4%)

   25-30 kg/m²

89 (22.9%)

65 (26%)

   >30 kg/m²

68 (17.5%)

118 (47.2%)

   Missing

35 (9%)

31 (12.4%)

Absolute dense area (Mean ± SD)

30.0 cm² ± 16.6

29.8 cm² ± 16.1

0.90

Area percent density (Mean ± SD)

20.1% ± 12.5

14.7% ± 9.7

<0.001*

Absolute dense volume (Mean ± SD)

137.7 cm³ ± 80.2

215.2 cm³ ± 138.0

<0.001*

Volume percent density (Mean ± SD)

25.1% ± 10.4

22.7% ± 9.6

0.003*