Table 4

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

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)

CI, confidence interval; SIR, standardized incidence ratio.

Stephansson et al. Breast Cancer Research 2010 12:R14   doi:10.1186/bcr2481