Table 1

Selected characteristics of the study subjects

CharacteristicCase/controlaORb (95% CI)
Age at menarche
 ≤1298/1011.0
 13–14219/2510.82 (0.59–1.16)
 ≥15150/1270.99 (0.68–1.46)
Age at first full-term pregnancy
 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)
No. 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)
Education
 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.