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Table 4 Observed and expected breast cancers among daughters by calendar year of cancer diagnosis

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

  Number of breast cancer cases   
Year of breast cancer diagnosis Observed Expected SIR 95% CI
Until1989 1,397 1,822 0.77 (0.73 to 0.81)
1990 to 1999 3,050 3,477 0.88 (0.85 to 0.91)
2000 and onwards 3,509 3,904 0.90 (0.87 to 0.93)
  1. CI, confidence interval; SIR, standardized incidence ratio.