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Shohoji Takao; Pasternack, Bernard
Health Physics: July 1973
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Since 1950 approximately 1600 exposed and control subjects who were in utero at the time of the atomic bombings (ATB) in Hiroshima and Nagasaki have been studied by the Atomic Bomb Casualty Commission (ABCC). The sample was drawn from the population of in utero children ATB who were either exposed or nonexposed (entering Hiroshima and Nagasaki between October 1945 and October 1955). Matching of subjects was carried out so that all available children exposed under 2000 m were entered into the study. For each child exposed proximally an attempt was made to include a child exposed distally and one not-in-city ATB-matched by sex, month of birth and economic status. Children at all stages of gestation were included. In this report, a four-parameter Gompertz curve is used to characterize the standing height growth during adolescence of these children. Based on maximum likelihood estimates of the four parameters, statistical analyses are performed to test for differences between sexes, cities, trimesters ATB, and exposure groups. The main findings are: (i) within each city males significantly differ from females; (ii) males and females in Nagasaki significantly differ from those in Hiroshima, respectively; (iii) differences among trimester ATB groups are, almost without exception, nonsignificant; (iv) differences among exposure groups are greater for males than for females, but no consistent findings relate growth impairment to exposure group and/or trimester ATB.

©1973Health Physics Society