1) 둔위분만의 빈도는 단태분만의 경우에는 2.9%, 단태 및 쌍대분만 전체로서는 3.8%였다. 2) 분만회수에 따른 빈도는 초산부에서 3.1% 이상 경산부에서 2.1% 이상이었다. 3) 임신주수는 38주 이상이 71.9%였고 태아체중은 2,500gm 이상이 72.6%였다. 4) 질식분만 209예 중에는 frank breech가 가장 많아 76예, 다음 incomplte breech 66예, complete breech 20예의 순이었다. 5) 분만방식은 partial extraction이 65.7%, 제왕절개술이 13.6%, 자연분만이 11.2%이고 total extraction이 6.2% 기타 3.3%의 순이었다. 6) 질식분만에서의 분만시간은 24시간 이내에 분만이 끝난 예가 초산부에서는 약 78%, 경 산부에서는 약 84%였다. 7) 모체 및 태아의 합병증으로는 임신중독증이 가장 많아 66예, 양막조기파수 26예, 협골반 12예, 태아가사 16예, 제대탈출 13예가 있었으며 그 외에 전치태반, 태반조기막리, 지연분만, 태반계유, 산후출혈, brachial palsy, 두개골골절 등이 있었다. 8) 조산기사망율은 초산부에서 111.9, 경산부에서 265.9, 전체적으로는 200.0이다. 9) 모체의 사망은 1예도 없었다.

It has been well known that the breech presintation is the most frequent abnormal presentation and has inherent obstetric problems especially on the fetal and maternal morbidity and complications in primigravida. From Jaruary, 1950 to December, 1968, there were 377 cases of breech delivery in the Dept. of Obstetrics and Gynecology, National Medical Center. The authors attempted ten years clinical survey on the above materials consisted of breech delivery of singletons of nullipara and multipara, and twins. The results obtained were as follows : 1) The incidence of breech delivery was 2.9% in singlitons and 3.8% in all deliveries of singlitons and twins. 2) The incidence based on the parity was 3.1% or over in nullipara and 2.1% or over in multipara. Age distribution was concentrated on the ages between 26-30. The youngest was 20 and the oldest was 53. 3) As to the gestational weeks and baby weight, 71.9% was 38 weeks or over and 72.6% was 2,500 gm or over, respectively. 4) Regarding the type of breech presentation the most common was frank breech (76 cases) and the others were in incomplete (66 cases) and complete breech (20 cases). 5) The mode of delivery in orders were partial extraction(65.7%), cesarean section (13.6%), spontaneous delivery (11.2%0, total extraction (6.2%0 and the other (3.3%). 6) As to the duration of the labor, 78% of nullipara and 84% of multipara were completed within 24 hours in vaginal delivery. 7) The maternal and fetal complications were in orders of toxemias of pregnancy (66 cases), early rupture of membranes (26 cases), cord prolapse (13 cases), contracted pelvis (12 cases) and the remainders were placenta previa, abruptio placentae, prolonged labor, retained placenta and postpartum bleeding. 8) The perinatal mortality was 111.9 in nullipara, 265.9 in, multipara and 200.0 in all. 9) No maternal death was encountered.