Pielet B W, Sabbagha R E, MacGregor S N, Tamura R K, Feigenbaum S L
Department of Obstetrics and Gynecology, Northwestern University Medical School, Chicago, IL.
Am J Obstet Gynecol. 1987 Dec;157(6):1411-4. doi: 10.1016/s0002-9378(87)80234-x.
Data from previous studies have suggested that birth weight prediction was enhanced by using formulas specifically derived from preterm fetuses. However, no prospective comparison of different formulas was performed. We obtained ultrasonic data on 61 pregnancies at risk for preterm delivery with a gestational age of 29.0 +/- 3.0 weeks (mean +/- SD). In all women birth weight was predicted within 7 days of delivery. Of the 61 pregnancies, 49 (80%), 41 (67%), 30 (49%), and 17 (28%) weighed less than 1750, 1500, 1250, and 1000 gm, respectively; 14 published formulas were compared for accuracy in predicting birth weight in these four categories. The formulas with the smallest absolute mean percent errors incorporated head and abdominal circumferences and femur length. The formula of Weiner et al., derived from low birth weight infants, produced the smallest absolute mean percent error and SD, 10.9% +/- 7.9%; this error was further reduced to 7.7% +/- 6.5% in infants weighing less than 750 gm. These findings suggest that birth weight in the preterm fetus is best predicted by a formula targeted to such a population.
以往研究的数据表明，使用专门从早产胎儿得出的公式可提高出生体重预测的准确性。然而，尚未对不同公式进行前瞻性比较。我们获取了61例有早产风险、孕周为29.0±3.0周（均值±标准差）的孕妇的超声数据。所有孕妇均在分娩前7天内预测了出生体重。在这61例妊娠中，出生体重分别低于1750克、1500克、1250克和1000克的孕妇分别有49例（80%）、41例（67%）、30例（49%）和17例（28%）；对14个已发表的公式在预测这四类出生体重时的准确性进行了比较。绝对平均百分比误差最小的公式纳入了头围、腹围和股骨长度。由低出生体重婴儿得出的韦纳等人的公式产生的绝对平均百分比误差和标准差最小，为10.9%±7.9%；在体重低于750克的婴儿中，这一误差进一步降至7.7%±6.5%。这些发现表明，早产胎儿的出生体重最好通过针对此类人群的公式来预测。
