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Analytical Approaches to and Interpretations of Data on Time, Rate, and Cause of Death of Mice Exposed to External gamma Irradiation

机译:外照射γ射线照射小鼠的时间,速率和死因数据的分析方法和解释

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Young adult male and female mice of inbred strains, A, BALB/c, C57BL/6, and C57L, and B6CF sub 1 and F sub 2 hybrids were exposed to daily duration-of-life external exp 60 Co gamma irradiation. Age at death was recorded, and most decedents were necropsied to ascertain occurrence of major types of tumors. Age- and cause-specific mortality or incidence rates were derived, and their regressions on age were fitted with polynomial equations by least-squares procedures. Age-specific and age-adjusted integrated lifetime risk in excess of the control population was expressed as the mortality ratio (irradiated/control). Linear and nonlinear functions and widely different life expectancies can be accommodated by this technique. These basic actuarial statistics provide a means for comparative analysis of dose-response functions, sex and genetic variables, relative vs. absolute risk, protraction or dose-rate factors, and major contributing causes of excess risk. They also provide a basis for extrapolation to man. As examples, life shortening in days per rad (4 days/100 rads accumulated) is generally independent of sex, genotype, and daily dose rate. The integrated average lifetime risk of death related to all tumors (0.025%/rad) is largely independent of sex, genotype and dose-rates

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