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Table 2 Familial relative risk for breast cancer by ER status of the index case tumour

From: Familial relative risks for breast cancer by pathological subtype: a population-based cohort study

  OBS EXP FRR 95%CI
Mothers     
   All cases 663 398.81 1.66 1.53 - 1.79
   ER-negative 84 45.09 1.86 1.46 - 2.27
   ER-positive 332 199.36 1.67 1.49 - 1.85
Sisters     
   All cases 416 207.25 2.01 1.81 - 2.21
   ER-negative 37 22.97 1.61 1.05 - 2.17
   ER-positive 226 106.81 2.12 1.83 - 2.41
All relatives     
   All cases 1079 606.06 1.78 1.68 - 1.89
   ER-negative 121 68.06 1.78 1.44 - 2.11
   ER-positive 558 306.17 1.82 1.67 - 1.98
  1. CI: confidence interval; ER: estrogen receptor; EXP: expected, FRR: familial relative risk; OBS: observed.