Table 3.
Person-years at risk | No. of breast cancers | Rate/1,000 person-years | Unadjusted RR (95 % CI) |
Age-adjusted* RR (95 % CI) |
|
---|---|---|---|---|---|
No benign breast disease | 3,549,268 | 6,513 | 1.84 | 1.00 (Referent) | 1.00 (Referent) |
Nonproliferative disease | 27,703 | 114 | 4.12 | 2.24 (1.86–2.70) | 2.23 (1.86–2.68) |
Proliferative disease without atypia | 5,731 | 38 | 6.63 | 3.61 (2.63–4.96) | 3.58 (2.61–4.91) |
Proliferative disease with atypia | 711 | 6 | 8.44 | 4.60 (2.08–10.15) | 4.56 (2.06–10.07) |
Total benign breast disease | 34,145 | 158 | 4.63 | 2.52 (2.16–2.95) | 2.51 (2.14–2.93) |
RR rate ratio, 95 % CI 95 % confidence interval
* Adjusted by continuous age