Deter R L, Hill R M, Tennyson L M
Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030.
J Clin Ultrasound. 1989 Feb;17(2):89-93. doi: 10.1002/jcu.1870170204.
This investigation has evaluated the ability of Rossavik growth models (derived from data obtained before 26 weeks) to predict birth characteristics in normal fetuses (assuming no growth after 38 weeks). Both weight and head circumference were predicted without systematic errors and the ranges of the random errors were approximately +/- 10% and +/- 5%, respectively. A range of approximately +/- 10% for the random error was also found for the abdominal and thigh circumferences, but both parameters were systematically overestimated (17.3% and 6.4%, respectively). No evidence of a relationship between the percent deviation and age at delivery (up to 41 weeks) was found for any of the parameters studied. As indicators of pregnancy outcome, Growth Potential Realization Index (GPRI) values were calculated for each parameter (predicted values corrected for systematic errors were used for the abdominal and thigh circumferences). Mean GPRI values were not significantly different from 100% and the ranges were approximately 90% to 110% except for the head circumference (range: 95% to 105%). These results indicate that GPRI values can be used to characterize the outcome of prenatal growth processes on an individual basis, with each fetus acting as its own control.
本研究评估了罗萨维克生长模型（源自孕26周前获得的数据）预测正常胎儿出生特征的能力（假设孕38周后不再生长）。体重和头围的预测均无系统误差，随机误差范围分别约为±10%和±5%。腹围和大腿围的随机误差范围也约为±10%，但这两个参数均被系统性高估（分别高估17.3%和6.4%）。在所研究的任何参数中，均未发现偏差百分比与分娩时年龄（直至41周）之间存在关联的证据。作为妊娠结局指标，为每个参数计算了生长潜能实现指数（GPRI）值（腹围和大腿围使用经系统误差校正的预测值）。除头围外（范围：95%至105%），平均GPRI值与100%无显著差异，范围约为90%至110%。这些结果表明，GPRI值可用于在个体基础上表征产前生长过程的结局，每个胎儿自身作为对照。
