Table 5. Modification of the excess relative risk of stomach cancer associated with external gamma ray exposure in the study cohort by occupation-related factors (both sexes, SmSta-adj model).
| Factors | Number of cases | ERRed/Gy | ||
|---|---|---|---|---|
| Unadjusted for internal alpha-radiation exposure | Adjusted for internal alpha-radiation exposure | |||
| Type of facility | Reactors | 87 | 0.30 (-0.09, 1.16) | 0.27 (-0.11, 1.09) |
| Radiochemical plant | 136 | 0.18 (-0.04, 0.55) | 0.17 (-0.07, 0.57) | |
| Plutonium production plant | 120 | 0.60 (0.03, 1.57) | 0.47 (-0.13, 1.51) | |
| p value (test for heterogeneity) | > 0.50 | > 0.50 | ||
| Age at first employment | < 20 | 58 | -0.02 (-0.41W, 0.51) | -0.01 (-0.43W, 0.54) |
| 20–30 | 162 | 0.20 (-0.04, 0.58) | 0.18 (-0.06, 0.56) | |
| 30+ | 123 | 0.31 (-0.01, 0.88) | 0.30 (-0.07, 0.93) | |
| p value (test for heterogeneity) | > 0.50 | > 0.50 | ||
| Period of employment | 1948–1958 | 208 | 0.16 (-0.03, 0.45) | 0.16 (-0.04, 0.48) |
| 1959–1972 | 107 | 0.13 (-0.76W, 1.61) | 0.05 (-0.82W, 1.52) | |
| 1973–1982 | 28 | -0.22 (-4.49W, 11.91) | -0.30 (-4.59W, 12.36) | |
| p value (test for heterogeneity) | > 0.50 | > 0.50 | ||
| Duration of employment | < 10 | 83 | 0.10 (-0.23W, 0.57) | 0.11 (-0.27W, 0.64) |
| 10+ | 260 | 0.24 (0.03, 0.56) | 0.21 (-0.01, 0.53) | |
| p value (test for heterogeneity) | > 0.50 | > 0.50 | ||
W denotes that an estimate was based on Wald’s statistics if a bound of a confidence interval was not defined.