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Table 1 Characteristics of the study population

From: Association of postmenopausal endogenous sex hormones with global methylation level of leukocyte DNA among Japanese women

  Mean Standard deviation
Age (years) 62.8 5.7
Height (cm) 152.9 5.5
Body mass index (kg/m2) 23.4 2.9
Age at menarche (years) 13.9 1.6
Age at menopause (years) 50.0 3.8
Age at first birth (years)* 26.2 3.3
  Number %
Family history of breast cancer, n (%) 17 9.2
History of benign breast disease, n (%) 11 6.0
Nulliparous, n (%) 17 9.2
Number of births (4 or more births), n (%)* 6 3.6
Breast feeding (yes), n (%)* 154 93.3
Smoking (ever smoker), n (%) 6 3.3
Alcohol drinking (drinker), n (%) 67 36.2
Physical activity in past 5 years (yes), n (%) 85 46.5
  1. *Among parous women only.