Table 1.

Characteristics of study subjects according to menopausal status

VariablesPremenopausal (n = 175)Postmenopausal (n = 123)
Age (y)43.1 (5.3)55.8 (7.2)
BMI (kg/m2)22.7 (3.0)23.2 (2.9)
Age at menarche (y)12.9 (1.3)14.0 (1.9)
Age at first birth (y)25.3 (3.1)24.4 (2.5)
Age at menopause (y)47.5 (5.3)
Number of parity2.3 (0.8)2.3 (0.9)
Alcohol intake (mL/d)6.8 (16.2)2.7 (5.2)
Current smokers (%)8.75.8
Ex-smokers (%)2.30.0
Breast-feeding (%)93.197.0
Family history of breast cancer among first-degree relatives (%)5.11.6
Percent density (%)35.3 (23.7)20.5 (16.7)
aMT6-s (ng/mg creatinine)43.2 (22.9)40.0 (25.6)
  • NOTE: Values are means (SD) or percentages.