Table 5. Risk of deaths from cancers other than lung cancer combined by cumulative radon exposure in WLM in the pooled 11 miner study and this study (categorical analyses and excess relative risk per WLM).
|
11 miners' cohort study (Darby et al, 1995a)a
|
Cumulative exposure to radon in WLM |
Present Wismut study
|
||||||
|---|---|---|---|---|---|---|---|---|
| Cumulative exposure to radon in WLM | Person-years | No. of cases | SMRb | Person-years | No. of cases | Relative risk | 95% CI | |
| — | — | — | 0 | 363 845 | 522 | 1.00 | ||
| <50 | 295 078 | 405 | 0.98 | >0–50 | 693 782 | 843 | 0.89 | 0.79–0.99 |
| 50–99 | 87 286 | 183 | 1.04 | 50–99 | 95 229 | 188 | 0.94 | 0.77–1.10 |
| 100–499 | 222 305 | 515 | 0.99 | 100–499 | 287 756 | 753 | 1.00 | 0.88–1.12 |
| 500–999 | 42 231 | 93 | 1.02 | 500–999 | 191 037 | 549 | 0.99 | 0.86–1.11 |
| 1000–1499 | 10 686 | 25 | 1.11 | 1000–1499 | 86 643 | 326 | 1.20 | 1.02–1.37 |
| 1500+ | 12 108 | 32 | 1.10 | 1500+ | 43 913 | 159 | 1.16 | 0.94–1.76 |
| Total | 669 694 | 1253 | 1 762 208 | 3340 | ||||
| ERR/WLMc (95% CI) | 0.01% (−0.01 to 0.02%) | 0.014% (0.006%–0.023%) | ||||||
a
Risk estimates based on comparisons with external mortality rates for the time period of more than 10 years since employment.
b
SMR=standardised mortality ratio, no confidence limits had been given in the original publication.
c
ERR/WLM=excess relative risk per working level months.