Stefos T, Deter R L, Hill R M, Simon N V
Department of Obstetrics-Gynecology, Baylor College of Medicine, Houston, TX 77030.
Am J Obstet Gynecol. 1989 Jul;161(1):179-83. doi: 10.1016/0002-9378(89)90261-5.
The ability of Rossavik growth models, determined from measurements obtained before 24 weeks, to predict third-trimester growth and birth characteristics in normally growing twins has been investigated. Third-trimester values for head circumference, abdominal circumference, and femur diaphysis length were predicted with an accuracy of +/- 6% to 9% (95% to 98% of percent deviations). For thigh circumference and estimated weight, the comparable values were +/- 15% and +/- 16%, respectively. The head circumference at birth was predicted without bias; the random error was approximately +/- 5% (94% of percent differences). Weight, abdominal circumference, and thigh circumference were systematically overestimated (3.1%, 14.9%, and 11.3%, respectively) as a result of differences in prenatal and postnatal measurement procedures. After correction for systematic errors, these parameters could be predicted with random errors of -11.5% to 7.2% (weight), -12.8% to 5.4% (abdominal circumference), and -15.3% to 10.0% (thigh circumference). Growth Potential Realization Index values were found to have means of approximately 100% and ranges from 91% to 118%. These results are similar to those for singletons and indicate that individual assessment of growth in twins can be carried out with the same methods used for singletons.
研究了根据24周前获得的测量值确定的罗萨维克生长模型预测正常生长的双胞胎孕晚期生长和出生特征的能力。对头围、腹围和股骨干长度的孕晚期值进行预测，准确率为±6%至9%（偏差百分比的95%至98%）。对于大腿围和估计体重，可比数值分别为±15%和±16%。出生时头围的预测无偏差；随机误差约为±5%（差异百分比的94%）。由于产前和产后测量程序的差异，体重、腹围和大腿围被系统性高估（分别为3.1%、14.9%和11.3%）。校正系统误差后，这些参数的随机误差预测范围为-11.5%至7.2%（体重）、-12.8%至5.4%（腹围）和-15.3%至10.0%（大腿围）。发现生长潜能实现指数值的平均值约为100%，范围为91%至118%。这些结果与单胎的结果相似，表明双胞胎生长的个体评估可以采用与单胎相同的方法进行。
