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A clinical study on twin.

Journal of the Korean Pediatric Society 1991;34(5):621-628.
Published online May 31, 1991.
A clinical study on twin.
Ho Joon Im, Sang Yoon Ahn, In Joon Seol, Soo Jee Moon, Hahng Lee
Department of Pediatrics, College of Medicine, Hanyang University, Seoul, Korea
쌍생아에 관한 임상적 고찰
임호준, 안상윤, 설인준, 문수지, 이항
한양대학교 의과대학 소아과학교실
Received: 10 November 1990   • Accepted: 26 February 1991
Among the total of 17,991 newborns delivered at Hanyang University Howpital from January 1980 to December 1989, a clinical study was performed on 277 twin pregnancies. The results of the study were as follows: 1) The incidence of twins was 1:64.9. 2) The average male-female sex ratio of twins was 1:1.1, total same sex pairs rate was 79.4% (male-male & female-female) and different sex rate was 20.6%. 3) The incidence of relation with maternal parity was highest at first pregnancy. 4) 54% of distribution of birth weight was below 2,500gm. 5) Birth weight related to gestational age: a. first twins showed peak level at 40 weeks of gestation as 2,694±410 gm b. second twins showed peak leval at 41 weeks of gestation as 2,694±407gm 6) In comparison of birth weight between co-twins, first-born twin was heavier than second-bom twin at 54.5% and there was about one-half a situation less than 10% difference in body weight between co-twins, second-bom twin was heavier than first born twin at 44.4%. 7) At 1 minute, over 8 apgar score were present in 81.2% of first twins and were present in 77.6% of secod twins. 8) Perinatal mortlaity was 99.3/1,000. 9) Causes of perinatal death were immaturity, respiratory distress syndrome, complication of pregnancy and labor, congenital anomalies and infection.
Key Words: Twins, Multiple birth

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