Table 2.

Characteristics [mean (SD) or %] of breast cancer cases and matched controls, NHS

CharacteristicsCases (n = 340)Controls (n = 677)
Age, y61.5 (4.7)61.5 (4.7)
BMI, kg/m227.1 (5.3)26.1 (4.6)
Age at menarche, y12.6 (1.4)12.7 (1.5)
Parity, children3.2 (1.8)3.3 (1.8)
Age at first birth*, y25.8 (3.5)25.7 (3.5)
Age at menopause, y49.9 (4.0)49.6 (4.6)
Nulliparous, %9.45.3
History of benign breast disease, %46.237.4
Family history of breast cancer, %19.714.0
  • * Among parous women only.

  • Among women with natural menopause or bilateral oophorectomy only.