Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination
Comparison of pregnancy dating by last menstrual period, ultrasound scanning, and their combination
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DOI：
10.1067/mob.2002.127601
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发表时间：
2002-12-01
影响因子：
9.8
通讯作者：
Herring, AH
中科院分区：
文献类型：
--
作者：
Savitz, DA;Terry, JW;Herring, AH
目的：本研究的目的是评估使用末次月经和早期超声信息的孕龄分配算法的准确性。研究设计：根据最后一次月经，超声波扫描，在北卡罗来纳州中部的产前护理诊所，（n = 3655）通过评估末次月经日期的数字偏好和使用K统计量比较平均胎龄、早产和过期类别、实际和预期分娩日期之间的差异以及具有差异分配的亚组之间的出生体重。末次月经报告显示手指偏好，分配妊娠平均比超声扫描多2.8天，产生更多的过期分娩（12.1%对3.4%），预测足月分娩的准确性较低。错误分类的出生后期是更常见的年轻女性，那些非最佳孕前体重，吸烟者，和妇女谁报告的最后一次月经期使用的首选日期的month.CONCLUSION：最后一次月经期估计的妊娠期的持续时间受到随机误差和系统的倾向，夸大妊娠期的持续时间，最有可能是因为延迟排卵。
OBJECTIVE: The purpose of this study was to evaluate the accuracy of algorithms for the assignment of gestational age with the use of the last menstrual period and early ultrasound information.STUDY DESIGN: Gestational age estimates that are based on last menstrual period, ultrasound scanning, or their combination were compared among women who attended prenatal care clinics in central North Carolina (n = 3655) by an evaluation of digit preference in the last menstrual period dates and a comparison of mean gestational age, preterm and postterm categories with the use of K statistics, difference between actual and expected delivery date, and birth weight among subgroups with discrepant assignments.RESULTS: Last menstrual period reports show digit preference, assign gestation 2.8 days longer on average than ultrasound scanning, yield substantially more postterm births (12.1% vs 3.4%), and predict delivery among term births less accurately. Misclassification of births as postterm was more common in younger women, those of nonoptimal prepregnancy body weight, cigarette smokers, and women who reported last menstrual period using preferred dates of the month.CONCLUSION: Last menstrual period estimates of the duration of gestation are subject to both random error and a systematic tendency to overstate the duration of gestation, most likely because of delayed ovulation.