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

From: Associations between breast density and a panel of single nucleotide polymorphisms linked to breast cancer risk: a cohort study with digital mammography

  Caucasian African-American p-value
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*
  1. Pearson χ2 test is used to test differences in BMI between the two groups; two-sample t-test with unequal variance is used to test for difference in age, Gail Lifetime Risk and breast density between the groups. * denotes statistical significance at the α = 0.05 level.