Table 2. Age at which women with a family history reach the cumulative risk of women lacking a family history at age 50 years for incidence (top) and for death (bottom) 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
First breast cancer
0–39	36	37.7	36.9	40.0	−12.3	38	41.1	38.4	43.5	−8.9
40–49	158	43.3	42.2	44.2	−6.7	126	44.5	43.6	45.7	−5.5
50–59	264	44.7	43.8	45.6	−5.3	146	44.8	44.1	46.1	−5.2
60–72	429	46.0	45.4	46.8	−4.0	62	47.0	45.6	48.9	−3.0
73–82	214	46.1	45.2	46.9	−3.9
>82	66	46.7	45.3	48.0	−3.3
Death by breast cancer
0–39	6	35.4	34.3	40.8	−14.6	9	38.3	32.5	42.6	−11.7
40–49	29	45.3	41.8	47.8	−4.7	31	44.5	42.3	46.8	−5.5
50–59	49	45.0	42.8	46.8	−5.0	32	43.9	39.4	47.4	−6.1
60–72	81	45.3	43.5	48.2	−4.7	12	49.7	37.4	56.3	−0.3
73–82	48	45.3	41.8	47.5	−4.7
>82	6	42.8	29.8	52.7	−7.2

Abbreviations: AD=age difference; CI=confidence interval.

^aNumber of cases until (Age).

^bAge to reach the same cumulative risk as women lacking a family history at age 50.

^cDifference between and ‘Age’ and 50 years.