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Table 1 Characteristics of study participants (N = 264), Wisconsin Breast Density Study, 2008 to 2009

From: Circulating serum xenoestrogens and mammographic breast density

  Mean ± SD or n(%)
Age (years) 60.6 ± 4.4
Body mass index (kg/m2)a 28.9 ± 6.6
First-degree family history of breast cancer 63 (23.9)
Nulliparous 67 (25.4)
Smoking status
  Never
  Former
  Current
159 (60.2)
91 (34.5)
14 (13.3)
Vigorous physical activity (hours per week)b 4.2 ± 5.0
College degreec 153 (58.2)
  1. SD, standard deviation. aBody mass index data was missing for two subjects. bPhysically vigorous activities that cause large increases in heart rate or breathing, such as sports activities, climbing stairs, heavy gardening, or lifting/carrying heavy objects. cEducation data were missing for one subject.