Table 2 Clinical characteristics of patients at the time of diagnosis and of controls. Controls are matched with patients for age.

Age

47.4 ± 10.9

46.9 ± 12.7

0.65

Pre-menopausal

59.5%

55.9%

0.75

BMI

27.7 ± 5.0

27.1 ± 4.3

0.16

   ≥50 years old

39.5%

41.3%

0.84

Married

84.1%

91.7%

0.53

   Never married ≥50 y

6.8%

5.7%

0.96

Nulligravida

13.9%

10.6%

0.38

   Nulligravida ≥50 y

9.4%

2.8%

0.11

Children

5.0 ± 3.3

5.4 ± 3.5

0.16

   Children, patients ≥50 y

6.1 ± 3.3

7.6 ± 3.3

0.001

History of mother or sister having breast cancer

11.1%

2.1%

< 0.001

History of mother or sister having breast cancer

     Patients ≥50 y

14.1%

3.1%

0.02