Table 1.

Baseline characteristics of postmenopausal case and control subjects

Controls (n = 672)
Cases (n = 165)
n (%)n (%)
Education (y)
    ≤5445 (66.12)102 (61.45)
    6-8127 (19.02)45 (27.11)
    >8100 (14.86)19 (11.45)
Hormone therapy use*
    Yes135 (20.30)40 (24.54)
    No530 (79.70)123 (75.46)
Oral contraceptive use*
    Yes84 (12.50)13 (7.88)
    No588 (87.50)152 (92.12)
Breast-feeding
    Yes511 (75.93)120 (72.29)
    No162 (24.07)46 (27.71)
Age at first birth
    Nulliparous65 (10.42)15 (9.04)
    Age <25274 (43.91)68 (40.96)
    Age >25285 (45.67)83 (50.00)
Family breast cancer
    Yes50 (7.43)22 (13.25)
    No622 (92.57)144 (86.75)

n
Mean ± SD
n
Mean ± SD
Age at baseline67158.10 ± 5.3316558.02 ± 5.31
Smoking (pack-years)6702.91 ± 7.381633.42 ± 8.61
Age at menarche67213.29 ± 1.5616513.24 ± 1.55
Age at menopause67248.86 ± 4.7616549.21 ± 4.49
Full-term pregnancy6722.09 ± 1.251652.05 ± 1.23
BMI* at baseline67026.31 ± 4.1416526.46 ± 4.36