Kurtz A B, Wapner R J, Kurtz R J, Dershaw D D, Rubin C S, Cole-Beuglet C, Goldberg B B
J Clin Ultrasound. 1980 Aug;8(4):319-26. doi: 10.1002/jcu.1870080406.
To date, there have been 25 studies attempting to correlate biparietal diameter and gestational age; of these, 17 meet specific criteria and thus are included in this evaluation. Although all studies have shown an increase in biparietal diameter with advancing gestational age, between 17 wk and term there is a discrepancy of approximately 3 wk. In this evaluation the charts are compared and the variations analyzed. An ideal table is constructed by combining the mean gestational age, calculated from a statistical analysis, and the variation at each millimeter point, determined by comparison of all the studies. It is hoped that this new 90% composite table, which consists of a range of gestational ages in weeks for each biparietal diameter, will not only provide more realistic indications of fetal age but also will serve as a reminder to sonographers, obstetricians, and patients of the relative accuracy and variations of biparietal diameter measurements.
迄今为止，已有25项研究试图将双顶径与孕周相关联；其中，17项符合特定标准，因此被纳入本评估。尽管所有研究均显示随着孕周增加双顶径增大，但在孕17周与足月之间存在约3周的差异。在本评估中，对这些图表进行比较并分析差异。通过结合根据统计分析计算出的平均孕周以及通过比较所有研究确定的每个毫米点的差异，构建了一个理想的表格。希望这个新的90%综合表格，其中每个双顶径对应一系列以周为单位的孕周范围，不仅能提供更符合实际的胎儿年龄指征，还能提醒超声检查医师、产科医生和患者注意双顶径测量的相对准确性和差异。
