Rosati P, Exacoustos C, Liverani A, Pieroni A, Puggioni G F, Caruso A
Istituto di Clinica Ostetrica e Ginecologica, Università Cattolica del Sacro Cuore, Roma.
Radiol Med. 1990 Nov;80(5):653-5.
In 73 pregnant patients at a gestational age under 36 weeks, who gave birth within 72 hours from the last US examination, mathematical equations were elaborated. The equations were aimed at predicting fetal weight by measuring the main US biometric parameters; the results were compared to the actual birth weight. A statistical analysis was performed using the "backward elimination" method. The linear equation that has provided with the best estimation of fetal weight is the following: fetal weight = 12.9875 BPD +29.5642 AD +28.8023 FL -3496.1265. According to this equation, about 95.22% of the variability of the unknown quantity (i.e. birth weight) can be ascribed to its correlation to the variables: biparietal diameter (BPD), abdominal diameter (AD) and femur length (FL). Estimated fetal weight by US, as calculated on the basis of biparietal diameter, abdominal diameter and femur length measurements, showed, in our study, a standard error of 143 g (9.02%) (R = 0.95).
在73名孕周小于36周且在末次超声检查后72小时内分娩的孕妇中，构建了数学方程。这些方程旨在通过测量主要超声生物测量参数来预测胎儿体重；并将结果与实际出生体重进行比较。采用“向后剔除”法进行统计分析。能对胎儿体重提供最佳估计的线性方程如下：胎儿体重 = 12.9875×双顶径（BPD） + 29.5642×腹径（AD） + 28.8023×股骨长度（FL） - 3496.1265。根据该方程，未知量（即出生体重）约95.22%的变异性可归因于其与变量：双顶径（BPD）、腹径（AD）和股骨长度（FL）的相关性。在我们的研究中，基于双顶径、腹径和股骨长度测量值计算得出的超声估计胎儿体重显示，标准误差为143克（9.02%）（R = 0.95）。
