There are large difference between twins and singletons in incidence, growth and development, perinatal death rate, morbidity, etc., Accordingly, if the statistics for singletons are applied to twins, the result is inappropriate.
The purpose of this study was to determine the incidence of twin pregnancies, compare intrauterine body weight with gestational age, estimate the perinatal mortality rate, investigate other factors related to maternal or fetal diseases, and make comparisons with other reports of Korean and western workers.
We sabmitted to analyze 303 mutiple pregnancies in 3 areas.
For 12 years from ,Jan. 1963 through Dec. 1974, there were 243 twin pregnancies among 19, 730 deliveries over 20 week of gestation at Severance Hospital, for 3 years from 1970 through 1972, there were 27 twin pregnancies among 1,738 deliveries at Won Ju Christian Hosoitai, and 28 twin pregnancies among 2,242 deliveries at Jeon Ju Presbyterian Hospital.
Data obtained were as follows.
1) The incidence of twins pregancy was 78.3: 1 in the 3 areas the sex ratio of twins were male 295. female 311 (M/M 113. F/F 121. iv1JF 6y. )
2) Birth weight related to gestational age.
a) The mean birth weight of twins at 40 weeks of gestation was 2, 617471 gm, and smaller than singletons by 600 gm at 40 weeks.
b) The birth weight of 1st twin at 40 weeks of gestation was 2.6754-4399m, and 2nd twin at 41 week of gestation was 2,613-+-4749m.
c) The body wight of male at 40 weeks cf geatation was 2.5 6441gm, female at 39 weeks of gestatica was 2,721:1-3559m.
Periatal mortality.
There were 33 cases of featal death and 54 cases of neonatal death among 606 twin, and the perinatal mortality rate was 143.6 over the 3 areas. The mortality rate of 2nd twin was higher than 1st twin.
4) The overall principal cause of neonatal death was prematurity with respiratory complication (68.5%), other causes of neonatal death were immaturity (14.8) atelectasis (5.5%), septicemia (3.7%0 congenital anomaly and birth trauma in descending order.
The leading causes of fetal death related to maternal or fetal diseases were SPRK hydroamnions, toxemia, placenta previa, maternal heart disease, fetus papyaceus, intrauterine infection, and anencephalus, etc.
The perinatal mortality rate of transeverse lie, face presentation, and compound presentation were higher than that of cephalic or breech presentations. The perinatal mortality rate of spontaneous vaginal delivery was higher than that of the low forcep delivery. 2nd twine delivered by C-Section had a higher perinatal death rate than 1st twin.
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