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Table 1 Selected characteristics of the 825 participants

From: Association between breast cancer susceptibility loci and mammographic density: the Multiethnic Cohort

Characteristic Value
Ethnicity  
   White 262 (31.8%)
   Japanese American 361 (43.8%)
   Native Hawaiian 202 (24.5%)
Menopausal status, hormone replacement therapy at first mammogram  
   Premenopausal 201 (24.4%)
   Postmenopausal, no hormone replacement therapy 204 (24.7%)
   Estrogen only hormone replacement therapy 228 (27.6%)
   Estrogen and progestin hormone replacement therapy 192 (23.3%)
Case status  
   Case 361 (43.8%)
   Control 464 (56.2%)
Family history (mother or sister)  
   Yes 114 (13.8%)
   No 711 (86.2%)
Mean age over all mammograms (years) 59.5 ± 8.8
Mean body mass index over all mammograms (kg/m2) 25.3 ± 5.5
Mean percent dense area (%) 32.7 ± 22.2
Mean dense area (cm2) 32.5 ± 25.4
Mean breast area (cm2) 117.1 ± 60.0
  1. Data presented as n (%) or mean ± standard deviation. The set of 825 subjects is the union of the individual sets of 634 to 806 subjects who were genotyped for each polymorphism of interest; that is, 825 subjects had at least one polymorphism of interest genotyped.