Table 1

Comparison of characteristics between breast cancer patients and controlsa

VariableCase (n = 300)Control (n = 300)P
Mean (SD)Mean (SD)
Age (year)48.5 (8.3)48.4 (8.4)0.139
Age at menarche (year)14.9 (1.9)14.7 (1.7)0.180
Age at first lifebirth (year)b26.6 (4.2)25.8 (4.1)0.005
Age at menopause (year)c48.9 (4.4)48.2 (4.4)0.185
BMI (kg/m2)
 Premenopause22.8 (2.9)22.4 (3.2)0.198
 Postmenopause24.5 (3.7)23.8 (3.7)0.130
WHR0.81 (0.05)0.80 (0.06)0.048
Total energy intake (calorie)2277 (507)2234 (474)0.275
PercentPercent P d
Education
 Elementary or less15.017.0
 Middle school42.741.3
 High school29.330.0
 College or higher13.011.70.879
Family income
 Low32.729.0
 Middle29.732.7
 High37.738.30.576
Menopause
 No57.257.1
 Yes (natural)39.538.6
 Yes (surgical)3.34.30.804
Number of parity
 161.159.0
 225.627.8
 3+13.313.20.839
Fibroadenoma
 No90.396.0
 Yes9.74.00.006
Family history
 No96.398.7
 Yes3.71.30.067
  • a From paired Student’s t test.

  • b Parous women.

  • d Among those with natural menopause.

  • d From χ2 test.