Table 4. Breast cancer 1956–2004 by stomach dose category.
| Dosea (mGy) | Person years | Cases | Backgroundb | Excessb(95% CI) | %ARc(95% CI) |
|---|---|---|---|---|---|
| <5.0 | 67631 | 25 | 30.7 | 0.3 (0.04–0.6) | 1.2 (0.2–2.4) |
| 5–9.9 | 75460 | 37 | 29.7 | 1.0 (0.2–2.1) | 2.7 (0.5–5.7) |
| 10–24.9 | 41377 | 8 | 10.5 | 1.1 (0.2–2.2) | 13.7 (2.5–27.5) |
| 25–49.9 | 48453 | 19 | 14.4 | 2.0 (0.4–4.1) | 10.5 (2.1–21.6) |
| 50+ | 37368 | 20 | 10.1 | 9.1 (1.7–18.7) | 45.5 (8.5–93.5) |
| Total | 270289 | 109 | 95.5 | 13.5 (2.5–27.8) | 12.4 (2.3–25.5) |
a
5-year lagged cumulative stomach dose.
b
Estimates of the number of background and radiation-associated excess cases based on a linear ERR model after background rates adjustment for effects of age, number of children, time of arrival on the contaminated territory (before and after 1953) and linear birth cohort effect.
c
AR–attributable risk estimated as the ratio of the number radiation-associated excess cases over the total number of cases in each stomach dose category.