Haines C J, Langlois S L, Jones W R
Am J Obstet Gynecol. 1986 Oct;155(4):838-41. doi: 10.1016/s0002-9378(86)80034-5.
The fetal femoral length and biparietal diameter were measured by ultrasound on 1657 occasions in 1289 singleton pregnancies between 12 and 41 weeks' gestation. Mean values for fetal femoral length were significantly lower than those demonstrated in previous studies, with the difference becoming greater approaching term. Three hundred twenty-two measurements of fetal femoral length were made on 57 patients with twin pregnancies, with no significant difference noted between the means of these recordings and the means of the singleton pregnancies.
在1289例单胎妊娠、孕龄12至41周期间，共1657次通过超声测量胎儿股骨长度和双顶径。胎儿股骨长度的平均值显著低于先前研究中的数值，且随着孕周接近足月，差异变得更大。对57例双胎妊娠患者进行了322次胎儿股骨长度测量，这些测量记录的平均值与单胎妊娠的平均值之间未发现显著差异。
