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Table 1 The distribution of women in the control group (n = 2167) and patients with breast cancer (n = 1492) according to the factors including age, education, body mass index (BMI), smoking and alcohol intake.

From: Breast cancer risk factors in Turkish women – a University Hospital based nested case control study

Factors women in the control group
(n = 2167)
patients with breast cancer (n = 1492)
Age (years)   
≥ 35
<35
1625 (75.0%)
541 (25.0%)
1410 (94.5%)
82 (5.5%)
35–39 253 (11.7%) 120 (8.2%)
40–49 636 (29.3%) 410 (27.5%)
50 737 (34.0%) 880 (58.8%)
Education (years)   
<13 1110 (51.2%) 891 (59.7%)
≥ 13 1057 (48.8%) 601 (40.3%)
Body mass index (BMI-kg/m 2 )   
<25 971 (44.8%) 534 (35.8%)
≥ 25 1196 (55.2%) 958 (64.2%)
Smoking   
Never 1517 (70.0%) 1141 (76.5%)
Ever 650 (30.0%) 351 (23.5%)
Alcohol intake   
Never 2166 (99.99%) 1489 (99.98%)
Ever 1 (0.01%) 3 (0.02%)
Family history of breast cancer [first-degree relative(s)]   
No 2059 (95.0%) 1384 (92.8%)
Yes 108 (5.0%) 108 (7.2%)