Table 1

Selected characteristics of the study subjects

Case/controlaORb (95% CI)
Menopausal status
Premenopausal164 /2041.0
Postmenopausal319 /2780.73 (0.42–1.27)
Age at menarche
<1398 /1011.0
13–14219 /2510.82 (0.59–1.16)
≥15150 /1270.99 (0.68–1.46)
Age at FFTP
Nulliparous102 /571.0
≤25237 /2630.55 (0.38–0.81)
26–3094 /1220.44 (0.29–0.69)
≥3147 /400.64 (0.36–1.12)
Number of full-term pregnancies
Nulliparous102 /571.0
168 /640.59 (0.36–0.98)
2141 /1810.50 (0.33–0.76)
3+171 /1800.54 (0.36–0.80)
Use of oral contraceptives
Never313 /2431.0
Ever164 /2390.66 (0.48–0.91)
Postmenopausal use of estrogen
Never221 /1641.0
Ever91 /1140.82 (0.58–1.16)
WHR
≤0.91187 /2361.0
>0.91291 /2431.38 (1.06–1.81)
BMI
≤25.4208 /2401.0
>25.4260 /2391.22 (0.92–1.62)
First-degree family history of breast cancer
No424 /4591.0
Yes54 /222.53 (1.48–4.31)
History of benign breast disease
No296 /3131.0
Yes180 /1671.33 (1.01–1.75)
Educationc
Low292 /2771.0
Medium127 /1351.11 (0.81–1.52)
High62 /691.19 (0.78–1.80)
Current alcohol intake
Never271 /2061.0
Once a month or less134 /1870.74 (0.54–1.01)
Daily–weekly75 /890.87 (0.59–1.29)
Smoking habits
Never363 /3511.0
Ex-smoker52 /670.94 (0.62–1.41)
Current smoker64 /641.34 (0.87–1.93)
  • a Total number of cases and controls does not correspond because of missing values.

  • b Adjusted for age.

  • c Low: none or primary school; medium: junior high school, college or corresponding; high: senior high school, trade school, or university.