Relative | No of person years | No of cases | Adjusted* RR (95% CI) |
---|---|---|---|
*Adjusted for number of relatives, attained age, BMI, personal breast cancer diagnosis, race, and menopausal status. The second degree variables were also adjusted for a first degree family history. | |||
Women who did not have relatives with breast cancer in that category formed the reference group for each group. | |||
Any family history | |||
No history | 283 382 | 352 | 1.0 (reference) |
1 affected | 111 368 | 138 | 0.9 (0.7 to 1.1) |
2 or more affected | 45 652 | 59 | 0.9 (0.7 to 1.2) |
Any affected | 157 020 | 197 | 0.9 (0.8 to 1.1) |
Unknown | 78 345 | 99 | 0.8 (0.6 to 1.0) |
Any 1st degree | |||
No history | 416 839 | 521 | 1.0 (reference) |
1 affected | 78 650 | 104 | 1.0 (0.8 to 1.2) |
2 or more affected | 13 331 | 15 | 0.8 (0.5 to 1.3) |
Any affected | 91 981 | 119 | 1.0 (0.8 to 1.2) |
Unknown | 9927 | 8 | 0.6 (0.3 to 1.1) |
Mother | |||
No history | 458 967 | 577 | 1.0 (reference) |
Mother affected | 50 579 | 64 | 1.0 (0.8 to 1.3) |
Unknown | 9201 | 7 | 0.5 (0.3 to 1.2) |
Sister | |||
No history | 467 353 | 583 | 1.0 (reference) |
1 affected | 38 600 | 50 | 0.9 (0.7 to 1.2) |
2 or more affected | 6412 | 9 | 0.9 (0.5 to 1.8) |
Any affected | 45 012 | 59 | 0.9 (0.7 to 1.2) |
Unknown | 6381 | 6 | 0.7 (0.3 to 1.6) |
Daughter | |||
No history | 509 734 | 638 | 1.0 (reference) |
1 affected | 3307 | 4 | 0.7 (0.3 to 2.0) |
2 or more affected | 452 | 1 | 0.8 (0.1 to 7.8) |
Any affected | 3759 | 5 | 0.8 (0.3 to 1.9) |
Unknown | 5255 | 5 | 0.7 (0.3 to 1.6) |
Any 2nd degree | |||
No history | 333 569 | 404 | 1.0 (reference) |
1 affected | 68 458 | 84 | 1.0 (0.7 to 1.2) |
2 or more affected | 20 309 | 30 | 1.1 (0.8 to 1.7) |
Any affected | 88 767 | 114 | 1.0 (0.8 to 1.2) |
Unknown | 96 411 | 130 | 0.9 (0.8 to 1.2) |
Grandmother | |||
No history | 410 817 | 508 | 1.0 (reference) |
1 affected | 21 126 | 21 | 0.8 (0.5 to 1.3) |
2 affected | 1196 | 2 | 1.2 (0.3 to 4.9) |
Any affected | 22 322 | 23 | 0.9 (0.6 to 1.3) |
Unknown | 85 609 | 117 | 1.0 (0.8 to 1.2) |
Aunt | |||
No history | 376 329 | 449 | 1.0 (reference) |
1 affected | 59 104 | 72 | 1.0 (0.7 to 1.3) |
2 or more affected | 13 754 | 25 | 1.5 (1.0 to 2.3) |
Any affected | 72 858 | 97 | 1.1 (0.8 to 1.3) |
Unknown | 69 560 | 102 | 1.1 (0.9 to 1.4) |