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Table 1 Participant characteristics

From: Height, adiposity and body fat distribution and breast density in young women

Descriptive characteristic n Mean (standard deviation) or %
Age (years) 174 27.16 (1.02)
Duration hormone use by current and former users (years) 163 5.64 (3.52)
Number of cigarettes per day by current smokers 40 8.53 (7.55)
Body mass index z-score at 8 to 10 years old 174 0.20 (0.89)
Race   
   White 156 89.66
   Nonwhite 18 10.34
Education   
   High school, vocational or technical school 18 10.34
   Some college 39 22.41
   Bachelor degree 92 52.87
   Graduate degree 25 14.37
Number of full-term pregnancies   
   0 127 72.99
   1 28 16.09
   2 to 4 19 10.92
Hormone use   
   Never 11 6.32
   Former 61 35.06
   Current 102 58.62
Smoking status   
   Never 97 55.75
   Former 37 21.26
   Current 40 22.99
Anthropometric measures   
   Height (cm) 174 165.09 (6.35)
   Waist (cm) 174 82.67 (12.36)
   Body mass index (kg/m2) 174 24.97 (4.82)
DXA body composition measures   
   Total fat (%) 174 35.40(8.80)
   Android:gynoid fat mass ratio 174 0.38 (0.12)
Breast density measures   
   Percentage dense breast volume (%) 174 28.15 (20.39)
   Absolute dense breast volume (cm3) 174 104.67 (71.28)