Table 1. Distribution of vital status in the Techa River Incidence female cohort by residence for subjects with and without breast cancer (follow-up period 1.1.1956–31.12.2004).
| Vital status as of 31.12.2004 | Cancer incidence catchment areaa (%) | Outside the catchment area (%) | Total (%) |
|---|---|---|---|
| Non cases (n=9777) | |||
| Alive | 2666–34.2 | 611–28.9 | 3277–33.1 |
| Dead | 4372–56.1 | 701–33.1 | 5073–51.2 |
| Cause known | 3820–87 | 412–59 | 4232–83 |
| Cause unknown | 552–13 | 289–41 | 841–17 |
| Current vital status unknown | 646–8.3 | 781–36.9 | 1427–14.4 |
| Breast cancer cases (n=131) | |||
| Alive | 41 | 4 | 45 |
| Dead | 66 | 18 | 84 |
| Cause known | 62 | 17 | 79 |
| Cause unknown | 4 | 1 | 5 |
| Current vital status unknown | 2 | 0 | 2 |
| Total | 7793–100 | 2115–100 | 9908–100 |
| Person-years | 270289 | 57684 | 327973 |
a
Cancer incidence catchment area includes four rayons through which Techa River flows (Kaslinsky, Krasnoarmeysky, Kunashaksky and Argayshsky) and Sosnovsky rayon where many exposed residents were resettled and Chelyabinsk city to which many of the cohort members moved.