Wiener S N, Flynn M J, Kennedy A W, Bonk F
Radiology. 1977 Mar;122(3):781-6. doi: 10.1148/122.3.781.
A composite curve of biparietal diameters at various gestational ages was constructed from previous reports from five large centers. Estimates of the mean gestational age using the composite curve compared favorably with other reporting institutions. This suggests that the newly established echography department may employ the composite curve of mean values and need not develop its own biparietal growth curve. The clinical application of these mean values however, should recognize a considerable variance from the mean. These variations represent normal growth differences in the biparietal dimension, errors inherent in the ultrasonic methodology and apparent differences in the populations examined. A method is suggested by which variations from the mean may be identified for each echographic facility.
通过五个大型中心的既往报告构建了不同孕周双顶径的复合曲线。使用该复合曲线估算的平均孕周与其他报告机构相比效果良好。这表明新成立的超声科可以采用均值复合曲线，无需自行绘制双顶径生长曲线。然而，这些均值的临床应用应认识到与均值存在相当大的差异。这些差异代表了双顶径维度的正常生长差异、超声方法固有的误差以及所检查人群的明显差异。本文提出了一种方法，通过该方法可以为每个超声检查机构识别与均值的差异。
