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6 x lo-' Gy'l). The differences should signal caution about the method of projecting risks over time in those exposed in childhood. , 1988; 1990). 5. Evidently the coefficients for the children (0 to 9 y of age) were derived over the entire observation period. , 1988). Perhaps it would have been more appropriate to project the childhood relative risks for the future decades as the average for these last two decades, rather than apply the earlier average as a constant excess relative risk over the entire lifetime of these children.
Evidently the coefficients for the children (0 to 9 y of age) were derived over the entire observation period. , 1988). Perhaps it would have been more appropriate to project the childhood relative risks for the future decades as the average for these last two decades, rather than apply the earlier average as a constant excess relative risk over the entire lifetime of these children. 4 Worker Populations. 3) employ the age group 25 to 64 y, whereas BEIR V (NASINRC, 1990) used the age group 18 to 65 years.
The analyses of the solid cancers were based on the mortality data for persons in the less than 4 Gy group (and who were no older than 75 y of age at death) because there was some evidence of departure from linearity of the dose response above 4 Gy. " The category of cancers of the digestive system was not more specificbecause of the inaccuracy of a number of death certificates, especially for cancers of the pancreas and liver, some of which were incorrectly certified as cancer of the stomach. 2 Reasons for Increase in Risk Estimates In 1977, the risk estimates of radiation-induced cancer depended on the estimate of the excess risk of leukemia a t low doses and the choice of the ratio of solid cancers to leukemia.