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Table 2 Risk factors in the Ella study by family history of breast cancer* ( n =914)

From: Family history of breast and ovarian cancer and triple negative subtype in hispanic/latina women

Risk factor First-degree family history No first-degree family history
  (n=135) (n=779)
  n(%) n(%)
Age at diagnosis, y   
  < 50 58 (43.0) 361 (46.3)
  ≥ 50 77 (57.0) 418 (53.7)
  Mean ± SD 53.6 ± 12.0 52.1 ± 12.4
Age at menarche, y   
  <13 65 (48.1) 346 (44.4)
  ≥ 13 70 (51.9) 433 (55.6)
  Mean ± SD 12.6 ± 1.6 12.8 ± 1.7
Parity   
  Nulliparous 13 (9.6) 75 (9.6)
  1–2 children 36 (26.7) 244 (31.3)
  ≥ 3 children 86 (63.7) 460 (59.1)
  Mean ± SD 3.3 ± 2.2 3.1 ± 2.3
Age at first full term pregnancy, y   
  < 21 41 (33.6) 288 (40.9)
  21–24 38 (31.1) 183 (26.0)
  ≥ 25 43 (35.2) 232 (33.0)
  Unknown 0 1 (.1)
  Nulliparous 13 75
  Mean ± SD 23.4 ± 5.6 22.8 ± 5.4
Time since last full-term pregnancy, y   
  > 10 40 (69.0) 216 (60.7)
  ≤ 10 18 (31.0) 140 (39.3)
  Postmenopausal or unknown 70 383
  Premenopausal but nulliparous 7 40
  Mean ± SD 12.8 ± 6.9 13.4 ± 8.0
Time from menarche to first pregnancy, y   
  < 8 32 (26.2) 277 (39.3)
  8–12 51 (41.8) 221 (31.5)
  ≥ 13 39 (32.0) 205 (29.1)
  Unknown 0 1 (0.1)
  Nulliparous 13 75
Mean ± SD 10.9 ± 5.6 9.9 ± 5.7
Lifetime duration of breastfeeding, mo   
  Never 31 (25.4) 170 (24.1)
  Up to 12 48 (39.3) 248 (35.2)
  ≥ 12 43 (35.2) 286 (40.6)
  Nulliparous 13 75
  Mean ± SD 15.6 ± 26.2 18.6 ± 31.5
Breastfeeding duration per birth, mo   
  Never 31 (25.4) 170 (24.2)
  > 0–5 54 (44.3) 269 (38.2)
  ≥ 5 37 (30.3) 265 (37.6)
  Nulliparous 13 75
Mean ± SD 4.5 ± 6.6 5.3 ± 6.8
Menopausal status at diagnosis   
  Pre 64 (47.8) 386 (50.2)
  Post 70 (52.2) 383 (49.8)
  Unknown 1 10
Age at menopause, y   
  < 50 41 (58.6) 226 (59)
  ≥ 50 29 (41.4) 157 (41)
  Premenopausal at diagnosis 64 386
  Unknown 1 10
  Mean ± SD 46.9 ± 6.9 47.3 ± 6.5
Hormone replacement therapy   
  Never 117 (87.3) 674 (87.3)
  Ever 17 (12.7) 98 (12.7)
  Unknown 1 7
Hormone contraceptive use   
  Never 58 (43.0) 345 (44.3)
  Ever 77 (57.0) 434 (55.7)
Tertile of duration of menstruation, y   
  7.6–27.35 21 (15.6) 172 (22.1)
  27.4–33.45 40 (29.6) 201 (25.8)
  33.5–50.5 65 (48.1) 343 (44)
  Unknown 9 (6.7) 63 (8.1)
  Mean ± SD 33.2 ± 6.7 32.1 ± 7.3
Country of residence   
  Mexico 46 (11.5) 355 (88.5)
  U.S. 89 (17.3) 424 (82.7)
  1. *History of breast cancer in one or more first-degree relatives.