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Clinical survey was performed on 413 cases of twin pregnancies and their 816 twin babies who were born at IlSin Christian Hospital during 5years from January 1987 to December 1991. The result of study was as follows :
1) There was 413 twin pregnancies among 40,711 deliveries, so the incidence of twins was 1 : 98.6.
Average male-female sex ratio of twins... |
