Table 1

Covariate distribution among 31,673 postmenopausal women with no history of BBD in 1986

CovariateMean (SD) or percentage
Age (mean years)56.8 (5.5)
BMI (mean kg/m2)25.8 (4.9)
Menarche before age 13 (%)47%
Parous (%)91.6%
Paritya (mean number of children)3.4 (1.6)
Age at first birthb (mean age)25.2 (3.5)
Family history of breast cancer (%)8%
Alcohol intake (mean g/day)6.3 (11.2)
Mean percentage of energy from
 Total fat32.3 (5.7)
 Saturated fat11.5 (2.6)
 Unsaturated fat20.8 (3.8)
 Oleic acid10.8 (2.3)
 Linoleic acid5.2 (1.5)
Trans fatty acid1.4 (0.5)
 Protein18.7 (3.4)
 Carbohydrates48.6 (7.9)
Total energy (mean kcal)1751 (519)
Physical activity (mean MET/wk)13.7 (17.9)
Currently using postmenopausal hormones (%)20.6%
  • a BMI, body mass index.

  • b Among parous women only.