1.3
GENERAL METHODS; CONTROL POPULATION
The facilities of the Marshall Island Memoria! Huspital in the Trust Territory Headquarters were madeavailabje for the clinical and laboratocy examinations. The resurvey included the establishment of a control group of unexposed Marshallese, in addi-ion to obtaining
interval histories, complete physical examinations, hematological studies, and radioactivity
excretion studies on all the exposed individuals. Similar examinations were conducted on thia
control group for Immediate comparison of findings and to serve as a base line for comparing
growth and cther future changes in the two groups.
The control patients were obtained principally from among the residents of the village of
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Rita, located about 2 miles from the hospital. This population was chosen on the basis of its
similarity with respect to the living conditions of the exosed peapl<, its relative permanence,
and ita accessibility to the Memorial Hospital. The individuals w> - selected on the basis of
age and sex to be paired with the members of the exposed group. ihus, each individual of the
exposed group was assigned a control individual of the same sex and approximately the same
age. The age distribution of the exposed and control pupulations is given with the hematological
results in Chap. 4. The age distribution of the exposed and control groups was the same, except that suitable controls were not found for two women of reported ages 60 and 100, 10r were
controls established for the three babies born to members of the exposed group since March,
1954. Numbers were assigned to the controls by adding 1000 to the number of the corresponding member of the exposed group. For example, Labnir, number 1011, was the control for
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4
REFERENCE
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1, E. P. Cronkite et 21., Study of Response of Huinan Beings Accidentally Exposed to Significant
Fallout Radiation, Operation Castle final report of Project 4.1.
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