Table 2

The distribution of women in the control group (n = 2167) and patients with breast cancer (n = 1492) according to the reproductive factors.

Factors

women in the control group

(n = 2167)

patients with breast cancer

(n = 1492)


Number of children


Nullipara

451 (20.8%)

241(16.2%)


≥ 1

1716 (79.2%)

1251 (83.8%)


≥ 4

353 (16.3%)

324 (21.7%)

1

312 (14.4%)

238 (12.4%)

2

678 (31.3%)

506 (33.9%)

3

373 (17.2%)

183 (15.8%)


Age at first birth (years)


<25

1697 (78.3%)

1158 (77.6%)


25–29

353 (16.3%)

231 (15.5%)


30–34

99 (4.6%)

64 (4.3%)


≥ 35

18 (0.8%)

39 (2.6%)


Breast feeding


Never

35 (1.6%)

126 (8.5%)


Ever

2132 (98.4%)

1366 (91.5%)


Spontaneous abortion


Never

1540 (71.1%)

1156 (77.5%)


Ever

627 (28.9%)

336 (22.5%)


Induced abortion


Never

1237 (57.1%)

750 (50.3%)


Ever

930 (42.9%)

742 (49.7%)


Oral contraceptive use


Never

1565 (72.2%)

1217 (81.6%)


Ever

602 (27.8%)

275 (18.4%)


Hormone replacement therapy


Never

1933 (89.2%)

1431 (95.9%)


Ever

234 (10.8%)

61 (4.1%)


Age at menopause (years)


<50

1553 (71.7%)

971 (65.1%)


≥ 50

614 (28.3%)

521 (34.9%)


Ozmen et al. World Journal of Surgical Oncology 2009 7:37   doi:10.1186/1477-7819-7-37

Open Data