Table 3. Age at which women with a family history reach the cumulative risk of women lacking a family history at age 40 years for incidence considering the diagnostic age of the relative.
| Maternal history | Sororal history | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Diagnostic age of relative (years) | No.a | Ageb (years) | 95% CI | ADc | No.a | Ageb (years) | 95% CI | ADc | ||
| 0–39 | 10 | 30.5 | 28.2 | 33.5 | −9.5 | 8 | 33.0 | 28.4 | 35.1 | −7.0 |
| 40–49 | 45 | 33.7 | 33.1 | 35.1 | −6.3 | 24 | 35.2 | 33.6 | 37.7 | −4.8 |
| 50–59 | 75 | 35.4 | 34.2 | 36.8 | −4.6 | 28 | 38.1 | 36.5 | 39.0 | −1.9 |
| 60–72 | 97 | 37.3 | 36.4 | 38.1 | −2.8 | 11 | 39.1 | 37.1 | 41.8 | −0.9 |
| 73–82 | 41 | 38.6 | 36.5 | 40.1 | −1.4 | |||||
| >82 | 12 | 39.3 | 35.3 | 41.2 | −0.8 | |||||
Abbreviations: AD=age difference; CI=confidence interval.
a
Number of cases until (Age).
b
Age to reach the same cumulative risk as women lacking a family history at age 40.
c
Difference between ‘Age’ and 40 years.