Owen P, Ogston S
Department of Obstetrics and Gynaecology, Ninewells Hospital and Medical School, Dundee, UK.
Ultrasound Obstet Gynecol. 1998 Feb;11(2):110-7. doi: 10.1046/j.1469-0705.1998.11020110.x.
A total of 274 low-risk pregnancies underwent predetermined, scheduled, serial ultrasound examinations and measurement of the biparietal diameter, fetal abdominal area, femur length and estimated fetal weight. The longitudinal nature of this dataset permits the construction of conditional centiles for these measurements, whereby the dimensions of an individual fetus at a given gestational age can be extrapolated to give a range of expected values (expressed as centiles) at a later gestational age. Examples of conditional centiles based upon 4-week measurement separations are presented. These conditional centiles permit the appropriate quantification and subsequent evaluation of time-dependent changes in fetal dimensions to be made.
共有274例低风险妊娠接受了预定的、定期的系列超声检查，并测量了双顶径、胎儿腹围、股骨长度和估计胎儿体重。该数据集的纵向性质允许构建这些测量值的条件百分位数，据此可以推断出特定孕周时单个胎儿的尺寸，以给出较晚孕周时的一系列预期值（以百分位数表示）。给出了基于4周测量间隔的条件百分位数示例。这些条件百分位数允许对胎儿尺寸随时间的变化进行适当的量化和后续评估。
