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Table 1 Observed and expected breast cancers among daughters by mother's age at diagnosis of diabetes

From: Risk of breast cancer among daughters of mothers with diabetes: a population-based cohort study

  Number of breast cancer cases   
Age of mother at diagnosis of diabetes (years) Observed Expected SIR 95% CI
Up to 49 911 1072 0.85 (0.80 to 0.91)
50 to 59 353 463 0.76 (0.69 to 0.85)
60 to 69 1,458 1,685 0.87 (0.82 to 0.91)
70 to 79 2,868 3,358 0.85 (0.82 to 0.89)
80 to 89 2,366 2,626 0.90 (0.86 to 0.94)
Total 7,956 9,204 0.86 (0.85 to 0.88)
  1. CI, confidence interval; SIR, standardized incidence ratio.