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Table 1 Characteristics of breast cancer patients and controls included in the study

From: Alcohol and breast cancer tumor subtypes in a Spanish Cohort

  Cases N = 1766 (%) Controls N = 833 (%)
Age, year 56.3 ± 12.3 53.2 ± 13.2
Age at menarche, year 13.2 ± 1.8 13.0 ± 1.7
Menopausal status
 Postmenopausal 1088 (65.0) 473 (58.0)
 Premenopausal 587 (35.0) 342 (42.0)
Family historya
 No 1459 (84.9) 735 (91.4)
 Yes 259 (15.1) 69 (8.6)
 Age at firts full-term pregnancy, year 24.8 ± 4.9 24.6 ± 5.2
Parity
 No 307 (17.5) 86 (10.5)
 Yes 1443 (82.5) 730 (89.5)
 Number of pregnancies 2.0 ± 1.4 1.9 ± 1.2
Breastfeeding
 No 782 (46.5) 340 (41.7)
 Yes 900 (53.5) 475 (58.3)
 Lifetime breastfeeding, months 6.0 ± 10.8 6.6 ± 11.0
 Body mass index, kg/m2 25.7 ± 4.5 26.6 ± 4.8
Oral contraceptive use
 Never 994 (60.5) 424 (52.1)
 Ever 649 (39.5) 390 (47.9)
Alcohol frequency
 0 drinks/week 752 [46.1] 417 [50.4]
 1–7 drinks/week 607 [37.3] 319 [38.5]
 >7 drinks/week 270 [16.6] 92 [11.1]
Smoking status
 No 1124 [68.2] 542 [65.2]
 Ex-smoker 268 [16.3] 147 [17.7]
 Current smoker 256 [15.5] 142 [17.1]
Hormone replacement therapy
 Never 1456 (90.3) 719 (91.1)
 Ever 156 (9.7) 70 (8.9)
Grade
 I 353 (22.3)  
 II 808 (51.1)  
 III 421 (26.6)  
Histology type
 Ductal invasive 1493 (85.2)  
 Lobular invasive 164 (9.4)  
 Other 95 (5.4)  
Tumor size (2.4 ± 1.6) cm
ER
 Positive 1321 (79.3)  
 Negative 345 (20.7)  
PR
 Positive 1093 (66.2)  
 Negative 559 (33.8)  
ER/PR/HER2
 ER+/or PR+/HER2− 952 (67.3)  
 ER+/or PR+/HER2+ 178 (12.6)  
 ER−/PR−/HER2− 204 (14.4)  
 ER−/PR−/HER2+ 80 (5.7)  
  1. aDefined as one or more first degree relatives with breast and/or ovarian cancer