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Table 7 Distributions of the risk factors among the WHI women by ER status

From: Risk prediction for estrogen receptor-specific breast cancers in two large prospective cohorts

  Tumor-free ER+ ER- Indefinite
n = 79,368 n = 2276 n = 421 n = 254
Age at menopause, years:
 ≤ 45 26.8 22.8 25.6 25.6
 45.1–50.0 34.4 31.9 38.0 35.8
 50.1–55.0 30.3 34.9 30.0 28.7
 > 55.0 8.5 10.4 6.4 9.9
Breastfeeding, months:
 0 47.9 45.6 48.7 50.8
 0.1–6.0 25.8 26.5 26.1 26.0
 6.1–12.0 11.4 12.5 8.8 11.0
 > 12.0 14.9 15.4 16.4 12.2
Age at menarche, years:
 ≤ 11 21.5 24.0 23.0 22.4
 12 26.2 26.2 28.3 23.6
 13 30.2 28.5 28.3 33.1
 14 13.1 13.3 11.9 13.0
 ≥ 15 9.0 8.0 8.5 7.9
HRT use, years:
 0 33.3 27.0 30.4 31.5
 0.1–1.0 8.5 6.6 8.3 8.7
 1.1–2.0 5.5 5.3 4.5 6.7
 2.1–3.0 4.4 4.8 4.3 4.3
 > 3.0 48.3 56.3 52.5 48.8
BMI, kg/m2:
 < 25.0 38.8 37.8 42.3 29.5
 25.0–29.9 35.2 35.2 30.1 33.9
 30–34.9 16.7 17.1 18.8 21.6
 ≥ 35.0 9.3 9.9 8.8 15.0
Alcohol intake, drinks/day:
 0 5.6 5.1 4.3 5.9
 < 1.0 77.7 75.4 8.0 76.0
 1.0–1.9 11.2 12.7 12.4 13.4
 ≥ 2.0 5.4 6.8 0.3 4.7
FTP:
 0 (no) 10.3 10.0 11.2 7.1
 1 (yes) 89.7 90.0 88.8 92.9
Number of FTP:
 1 9.5 9.7 8.8 12.3
 2 30.2 33.2 34.5 27.5
 ≥ 3 60.3 57.1 56.7 60.2
Age at 1st FTP, years:
 ≤ 20.0 13.0 11.0 9.9 16.5
 20.1–25.0 49.4 45.6 52.4 44.9
 25.1–30.0 28.5 30.0 30.2 28.8
 30.1–35.0 7.0 10.3 5.6 8.5
 > 35.0 2.1 3.1 1.8 1.3
Height, cm, mean 162.2 162.6 162.4 162.9
  1. Values are percentages unless otherwise indicated
  2. BMI body mass index, ER estrogen receptor, FTP full-term pregnancy, HRT hormone replacement therapy, WHI Women’s Health Initiative