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.
@ES The result of study was as follows:
@EN 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 was 1.3:1, same sex pairs rate was 86% and different sex ratio was 14%.
2) The incidence of relation with maternal age was highest between 25 years old and 29 years old but the ratio of twin delivery to total delivery was 0.9% so, was not higher than other age group.
3) The incidence of relation with maternal parity was highest at first pregnancy but the ratio of twin delivery to total delivery was highest at second pregnancies.
4) Normal birth weight infants were 45.7%, low birth weight infants were 54.3% and very low birth weight infants was 9.3%.
Fullt-erm infants were 63.7% and prematurity were 35.4%.
5) The incidence of feto-fetal transfusion was 7.3%.
6) Perinatal death rate was 76.3 and was more higher in second babies.
The most common cause of perinatal death was prematurity, followed by respiratory complication, congenital anomaly, infection and asphyxia. Still-births were 8 cases.
|