Table 2

Demographic and other risk characteristics of women by study population

General sample (n = 317)African-American (n = 27)Lesbian (n = 65)Ashkenazi Jewish (n = 82)
Age
 Mean (SD)42.2 (11.0)43.9 (11.5)40.8 (8.7)46.6 (9.9)
 Range20–7325–7224–6627–70
Age at menarche
 ≤1158 (18.3)a8 (29.6)11 (16.9)14 (17.1)
 12–13210 (66.2)13 (48.1)45 (69.2)49 (59.8)
 14+49 (15.5)6 (22.2)9 (13.8)19 (23.2)
Ever had a live birth221 (69.7)23 (85.2)21 (32.3)68 (82.9)
Age at first birthb
 ≤2463 (28.5)12 (52.2)6 (28.6)15 (22.1)
 25–2967 (30.3)3 (13.0)6 (28.6)22 (32.4)
 30+62 (28.1)3 (13.0)2 (9.5)19 (28.0)
 no live births27 (12.2)5 (21.7)7 (33.3)11 (16.2)
No. of first-degree relatives with breast cancer
 074 (23.2)13 (48.1)30 (46.2)46 (56.1)
 1234 (73.8)14 (51.9)33 (50.8)36 (43.9)
 2+9 (2.8)0 (0)2 (3.1)0 (0)
No. of second-degree relatives with breast cancer
 0161 (50.8)12 (44.4)24 (36.9)22 (26.8)
 1114 (36.0)11 (40.7)35 (53.8)48 (58.5)
 2+42 (13.2)4 (14.8)6 (9.2)12 (14.6)
≥1 breast biopsy52 (16.4)0 (0.0)7 (10.8)13 (15.9)
  • a Number (percentage).

  • b Among women who had ever been pregnant.