Robinson H P, Sweet E M, Adam A H
Br J Obstet Gynaecol. 1979 Jul;86(7):525-8. doi: 10.1111/j.1471-0528.1979.tb10804.x.
Radiological estimates of gestational age in late pregnancy were compared with the gestational ages based on first trimester ultrasound crown-rump length measurements in a series of 125 patients. It was found that the 95 per cent confidence limits of a radiological estimate were +/- 3 1/2 weeks, that both distal femoral and upper tibial epiphyses were frequently present much earlier than 36 and 38 weeks respectively, and that in almost half of the growth-retarded babies in the series there was a bone-age discrepancy of three or more weeks. It is recommended that more liberal use is made of early ultrasound measurements for the assessment of gestational age.
对125例患者进行了研究，比较了妊娠晚期根据放射学估计的孕周与基于孕早期超声头臀长度测量得出的孕周。结果发现，放射学估计孕周的95%置信区间为±3.5周，股骨远端和胫骨近端骨骺分别常在早于36周和38周时就频繁出现，并且该系列中几乎一半的生长受限婴儿存在3周或更长时间的骨龄差异。建议更广泛地利用早期超声测量来评估孕周。
