Leveno K J, Santos-Ramos R, Duenhoelter J H, Reisch J S, Whalley P J
Am J Obstet Gynecol. 1979 Nov 15;135(6):727-30. doi: 10.1016/0002-9378(79)90382-x.
In 123 normal twin pregnancies, 589 biparietal diameter (BPD) measurements were obtained between 16 and 40 weeks' gestation and mean values for each week were computed. A table of BPDs for normal twin pregnancies based on these data is proposed. Mean twin BPDs were consistently smaller than those of singletons, the difference averaging 3.5 mm between 16 and 40 weeks' gestation. The development of a twin BPD table now permits a more accurate assessment of twin gestational age and fetal growth.
在123例正常双胎妊娠中，于妊娠16至40周期间获得了589次双顶径（BPD）测量值，并计算了每周的平均值。基于这些数据，提出了一个正常双胎妊娠的BPD表格。双胎的平均BPD始终小于单胎，在妊娠16至40周期间，差异平均为3.5毫米。双胎BPD表格的制定现在允许对双胎胎龄和胎儿生长进行更准确的评估。
