==================================HSR26================================== 26. Interested in current methods of diagnosis and classification and long term programming of the mentally retarded in the USSR. Major classification is 'Mental Retardation'; subterms: 'classification', 'diagnosis', 'etiology', 'education', 'psychology', 'psychosocial'. 1 UI - 86110173 AU - Bochkov NP ; Grigorian SD ; Lunga IN ; Nikolaeva IV ; Prussakov VM ; Tikhopoy MV TI - Retro- and prospective evaluation of dynamics of some mutational events. AB - The dynamics of some mutational events were studied in a Siberian town with a chemical industry. Retro- and prospective evaluations of the frequency of spontaneous abortions, multiple congenital malformations, and Down syndrome were carried out. Mutational components of these endpoints were summarized and provisionally termed "units of mutational events: (UME). The results show that the frequencies of UME have not changed in 14 years. MH - Abnormalities, Multiple/*FAMILIAL & GENETIC/OCCURRENCE ; Abortion/ *FAMILIAL & GENETIC/OCCURRENCE ; Down's Syndrome/*FAMILIAL & GENETIC/ OCCURRENCE ; Female ; Human ; Infant, Newborn ; Models, Genetic ; *Mutation ; Pregnancy ; Prospective Studies ; Retrospective Studies ; Siberia SO - Hum Genet 1986 Jan;72(1):77-9