Table 2.

Distribution of selected characteristics and risk factors by race/ethnicitya

Non-Hispanic whiteHispanic whiteAfrican AmericanAsian/Pacific IslanderNative American/Alaska native
 (N = 2068) (N = 283) (N = 153) (N = 123) (N = 56)
Variablen, %n, %n, %n, %n, %
Study site
 Seattle1,668 (80.7) 36 (12.7) 139 (90.8) 119 (96.7) 40 (71.4)
 New Mexico 400 (19.3) 247 (87.3) 14 (9.2) 4 (3.3) 16 (28.6)
Age at diagnosis
 <40 246 (11.9) 56 (19.8) 25 (16.3) 30 (24.4) 7 (12.5)
 40–49 537 (26.0) 89 (31.4) 50 (32.7) 41 (33.3) 16 (28.6)
 50–59 731 (35.3) 79 (27.9) 49 (32.0) 31 (25.2) 18 (32.1)
 60–69 554 (26.8) 59 (20.8) 29 (19.0) 21 (17.1) 15 (26.8)
Health insurance status
 Any private1,751 (86.4)194 (69.0)100 (67.6)100 (82.0)31 (57.4)
 Any Medicaid88 (4.3)50 (17.8)20 (13.5)10 (8.2)8 (14.8)
 Medicare127 (6.3)17 (6.0)21 (14.2)8 (6.6)13 (24.1)
 No insurance61 (3.0)20 (7.1)7 (4.7)4 (3.3)2 (3.7)
 Missing412512
Parity
 Nulliparous524 (25.5)36 (12.8)23 (15.1)19 (15.7)11 (19.6)
 Parous1,529 (74.5)246 (87.2)129 (84.9)102 (84.3)45 (80.4)
 Missing151120
Number of full-term pregnancies
 Nulliparous524 (25.5)36 (12.8)23 (15.1)19 (15.7)11 (19.6)
 1352 (17.1)43 (15.2)31 (20.4)28 (23.1)11 (19.6)
 2743 (36.2)93 (33.0)37 (24.3)45 (37.2)15 (26.8)
 ≥3434 (21.1)110 (39.0)61 (40.1)29 (24.0)19 (33.9)
 Missing151120
Age at first full-term pregnancy (in years)b
 <20212 (14.9)55 (28.5)43 (35.5)8 (8.1)13 (31.0)
 20–24442 (31.0)85 (44.0)44 (36.4)25 (25.3)14 (33.3)
 25–29405 (28.4)35 (18.1)14 (11.6)31 (31.3)8 (19.0)
 ≥30365 (25.6)18 (9.3)20 (16.5)35 (35.4)7 (16.7)
 Missing10553833
Age at menopause (in years)c
 <45172 (17.7)28 (23.3)16 (29.1)4 (12.1)2 (8.7)
 45–54703 (72.2)88 (73.3)33 (60.0)24 (72.7)18 (78.3)
 ≥5599 (10.2)4 (3.3)6 (10.9)5 (15.2)3 (13.0)
 Missing152131566
Age at menarche (in years)d
 <12281 (20.0)6 (21.4)31 (32.6)27 (27.0)10 (29.4)
 12–13831 (59.1)15 (53.6)48 (50.5)47 (47.0)16 (47.1)
 ≥14295 (21.0)7 (25.0)16 (16.8)26 (26.0)8 (23.5)
 Missing261844196
Ever breast feedingb,d
 No244 (21.3)3 (12.5)25 (30.1)14 (15.7)9 (27.3)
 Yes814 (71.0)19 (79.2)51 (61.4)69 (77.5)22 (66.7)
Duration of breast feeding (in months)b,d
 Never244 (23.1)3 (13.6)25 (32.9)14 (16.9)9 (29.0)
 <6300 (28.4)7 (31.8)20 (26.3)25 (30.1)11 (35.5)
 6–11195 (18.4)3 (13.6)14 (18.4)17 (20.5)4 (12.9)
 12–23169 (16.0)5 (22.7)9 (11.8)15 (18.1)2 (6.5)
 24–3588 (8.3)3 (13.6)3 (3.9)9 (10.8)3 (9.7)
 ≥3662 (5.9)1 (4.5)5 (6.6)3 (3.6)2 (6.5)
  • aTwenty-seven women with unknown race/ethnicity were dropped from this table.

  • bAmong parous women only.

  • cAmong postmenopausal women only.

  • dAmong Seattle cases only.