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Table 1.

Distribution of nondietary factors among study subjects according to menopausal status

VariablesPremenopausal (n = 348)Postmenopausal (n = 253)
Age (y) 42.6 (5.8) 57.8 (6.1) 
BMI (kg/m222.1 (2.9) 23.0 (3.0) 
Education (y) 2.7 (1.8) 11.1 (2.1) 
Age at menarche (y) 12.8 (1.3) 14.1 (1.7) 
Age at first birth (y) 25.3 (2.7) 24.8 (2.9) 
Age at menopause (y) — 49.2 (4.2) 
Parity 2.2 (0.8) 2.3 (0.8) 
Alcohol intake (mL/d) 6.6 (17.1) 4.7 (13.1) 
Exercise (MET h/wk) 31.0 (39.8) 30.0 (44.1) 
Current smokers (%) 9.2 4.1 
Ex-smokers (%) 5.2 2.8 
Family history of breast cancer   
    Among first-degree relatives (%) 4.6 4.0 
Breast feeding (%) 90.1 90.0 
VariablesPremenopausal (n = 348)Postmenopausal (n = 253)
Age (y) 42.6 (5.8) 57.8 (6.1) 
BMI (kg/m222.1 (2.9) 23.0 (3.0) 
Education (y) 2.7 (1.8) 11.1 (2.1) 
Age at menarche (y) 12.8 (1.3) 14.1 (1.7) 
Age at first birth (y) 25.3 (2.7) 24.8 (2.9) 
Age at menopause (y) — 49.2 (4.2) 
Parity 2.2 (0.8) 2.3 (0.8) 
Alcohol intake (mL/d) 6.6 (17.1) 4.7 (13.1) 
Exercise (MET h/wk) 31.0 (39.8) 30.0 (44.1) 
Current smokers (%) 9.2 4.1 
Ex-smokers (%) 5.2 2.8 
Family history of breast cancer   
    Among first-degree relatives (%) 4.6 4.0 
Breast feeding (%) 90.1 90.0 

NOTE: Values are means (SD) or percentages. Breast feeding: self-reported, ever/never.

Abbreviation: MET, metabolic equivalents.

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