Morbidity Estimation in Changeable Cohort of Children Being Chronically Exposed by Low Level Doses of Radiation in Consequence Chernobyl Accident. E. I. Bomko, Scientific Centre for Radiation Medicine of Ukrainian Academy of Medical Science, Melnikova St., 53, Kiev, 252051, Ukraine
The low level dose effects are a subject for scientific discussion for many years. To survey this problem a prospective investigation was organised. A cohort of 10 000 children and persons exposed in child age (1972-1986 years of birth) was formed. All of those people were victims of the Chernobyl accident and were registered in data base of the Ukrainian State Register of people who had been exposed in consequence the Chernobyl accident. The cohort consists of four subcohorts. Each of the samples has a specific level of internal and external exposure. The doses have been accumulated for 10 years.
The cohort was stratified by age: 7-14 at the moment of studying (0-7 at the moment of the accident). The cohort is changeable. The morbidity was estimated with first registered incidences. Indexes were grouped into time series and then the series were smoothed.
Comparing of the indexes of the subcohorts revealed that the morbidity indexes were higher for such classes of diseases as: "Blood and hemopoetic organs diseases"; "Diseases of the Digestive System" (among children of the sample with accumulated dose >50 mSv). The morbidity indexes of the classes "Nervous system and sensoric organs diseases" and "Respiratory system diseases" were higher among evacuated children. A tendency to rising was determined for the class "Neoplasms" among the evacuated children. Reliable difference was checked with chi-square method.
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