Jordaan H V
Am J Obstet Gynecol. 1978 May 1;131(1):53-9. doi: 10.1016/0002-9378(78)90473-8.
Interpopulation differences in the term BPD and its relations to BW stress the need for each institution to analyze its own data. Variations in the BPD as a function of BW do not connote differences in the brain: body weight relationship, because the neurocrania of all term fetuses are not homomorphic. Differentiation of neurocranial form accounts for there being no consistent relationship between the BPD and calculated brain weight in interpopulation comparisons. The wide scatter of BPD and BW values in data from a single source challenges the wisdom of judging individual serial BPD readings by mean population values. Because the correlation between BW and the common indices of maternal size (stature, weight, and surface area) is too low (r = 0.27, 0.27, and 0.35, respectively) to provide a useful means of determining the fetal growth potential, each fetus should be used as its own control in serial cephalometry.
足月胎儿双顶径（BPD）的群体间差异及其与体重（BW）的关系强调了每个机构分析自身数据的必要性。作为体重函数的BPD变化并不意味着脑与体重关系存在差异，因为所有足月胎儿的神经颅骨并非同形。神经颅骨形态的差异导致在群体间比较中，BPD与计算出的脑重量之间不存在一致的关系。来自单一来源数据中BPD和BW值的广泛离散，对用群体平均值判断个体连续BPD读数的合理性提出了质疑。由于体重与母亲体型的常用指标（身高、体重和表面积）之间的相关性过低（分别为r = 0.27、0.27和0.35），无法提供确定胎儿生长潜力的有用方法，因此在连续头测量中，每个胎儿都应作为自身对照。
