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Table 1 Frequency distribution (%a) of 4523 women with invasive breast cancer by selected characteristics at diagnosis and alcohol drinking status from age 15 years until diagnosis

From: Pre-diagnosis alcohol consumption and mortality risk among black women and white women with invasive breast cancer

  Non-drinkers
(N = 1779)
Drinkers
(N = 2744)
P valueb
Age at diagnosis (years)    < 0.0001
35–44 515 (29.0) 914 (33.3)  
45–54 617 (34.7) 994 (36.2)  
55–64 647 (36.4) 836 (30.5)  
Study site    < 0.0001
Atlanta 331 (18.6) 545 (19.9)  
Seattle 285 (16.0) 767 (28.0)  
Detroit 299 (16.8) 367 (13.4)  
Philadelphia 306 (17.2) 393 (14.3)  
Los Angeles 558 (31.4) 672 (24.5)  
Race    < 0.0001
White 949 (53.3) 1976 (72.0)  
Black 830 (46.7) 768 (28.0)  
Education    < 0.0001
<High school 177 (10.0) 214 (7.8)  
High School 620 (34.9) 703 (25.6)  
Technical school/some college 597 (33.6) 867 (31.6)  
College graduates 385 (21.6) 960 (35.0)  
Household income, times the federal poverty guideline    0.008
0–< 2 313 (17.6) 450 (16.4)  
2–< 3 299 (16.8) 456 (16.6)  
3–< 5 453 (25.5) 603 (22.0)  
5–< 7 391 (22.0) 625 (22.8)  
≥7 279 (15.7) 530 (19.3)  
Unknown 44 (2.5) 80 (2.9)  
Menopausal status at diagnosis    < 0.0001
Premenopausal 742 (41.7) 1353 (49.3)  
Postmenopausal 835 (46.9) 1066 (38.9)  
Unknown 202 (11.4) 325 (11.8)  
Number of mammograms in 5 years before diagnosis    0.83
0 536 (30.1) 809 (29.5)  
1 313 (17.6) 477 (17.4)  
2–3 396 (22.3) 643 (23.4)  
≥4 534 (30.0) 815 (29.7)  
Body mass index 5-yrs before diagnosis (kg/m2)    < 0.0001
< 20 150 (8.4) 334 (12.2)  
20–24.9 698 (39.2) 1371 (50.0)  
25–29.9 505 (28.4) 678 (24.7)  
≥30 426 (24.0) 361 (13.2)  
Number of comorbid conditionsc    < 0.0001
0 1032 (58.0) 1809 (65.9)  
1 576 (32.4) 767 (28.0)  
≥2 171 (9.6) 168 (6.1)  
Cigarette smoking status at diagnosis    < 0.0001
Never 1078 (60.6) 996 (36.3)  
Former 426 (24.0) 1060 (38.6)  
Current 275 (15.5) 688 (25.1)  
Stage of disease at diagnosis    0.001
Localized 1022 (57.5) 1710 (62.3)  
Non-localized 757 (42.5) 1034 (37.7)  
Estrogen receptor status of tumor    < 0.0001
Positive 969 (54.5) 1685 (61.4)  
Negative 558 (31.4) 743 (27.1)  
Unknown 252 (14.2) 316 (11.5)  
Histologic type    0.24
Ductal 1348 (75.8) 2071 (75.5)  
Lobular 193 (10.9) 336 (12.2)  
Others 238 (13.4) 337 (12.3)  
  1. aPercentage may not sum to 100% due to rounding
  2. bP-value ascertained from Chi-square test,
  3. cComorbidities included hypertension, myocardial infarction, stroke, diabetes, and cancers other than non-melanoma skin cancers
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