Kurniawan Y S, Deter R L, Visser G H, Simon N V, van der Weele L T
Department of Obstetrics and Gynecology, University Hospital Groningen, The Netherlands.
J Clin Ultrasound. 1994 May;22(4):245-52. doi: 10.1002/jcu.1870220406.
The usefulness of the Rossavik growth model in predicting crown-heel length (CHL) was evaluated in 50 women with normal singleton pregnancies in a Dutch population. The femur diaphysis lengths (FDL) were predicted assuming growth cessation at 38, 39, 39.5, and 40 weeks, menstrual age (MA), and at birth using Rossavik growth models determined from two second-trimester FDL measurements. Predicted CHLs were then calculated from predicted FDLs using six different equations. Predicted CHLs were compared with the actual neonatal CHLs and the percent differences calculated. The growth potential realization index (GPRI) values were also determined. With all six equations, regression analysis revealed a significant relationship between the percent differences and birth ages for those infants delivering after 38 and 39 weeks, MA, respectively. The signs of the slopes of the regression lines were negative, indicating continued growth of these fetuses. With the Vintzileos equation, no evidence of continued growth was obtained after 39.5 weeks, MA. The systematic prediction error at this time point was 0.9%, whereas the random error was 3.3%. The mean GPRICHL was 99%, with a 95% range of 93% to 104%. These findings indicate that the CHL can be predicted with a high degree of accuracy in this Dutch population if the appropriate growth cessation age and FDL-CHL function are used.
在荷兰人群中，对50例单胎妊娠正常的女性评估了Rossavik生长模型预测顶臀长度（CHL）的有效性。假设在孕38、39、39.5和40周、月经龄（MA）以及出生时生长停止，使用根据孕中期两次股骨骨干长度（FDL）测量确定的Rossavik生长模型预测FDL。然后使用六个不同的方程从预测的FDL计算预测的CHL。将预测的CHL与实际新生儿CHL进行比较并计算百分比差异。还确定了生长潜能实现指数（GPRI）值。使用所有六个方程，回归分析显示，对于分别在孕38周和39周、MA后出生的婴儿，百分比差异与出生年龄之间存在显著关系。回归线斜率的符号为负，表明这些胎儿在持续生长。使用Vintzileos方程，在孕39.5周、MA后未获得持续生长的证据。此时的系统预测误差为0.9%，而随机误差为3.3%。GPRI CHL的平均值为99%，95%范围为93%至104%。这些发现表明，如果使用适当的生长停止年龄和FDL-CHL函数，在该荷兰人群中可以高度准确地预测CHL。
