Petersen D J, Alexander G R, Powell-Griner E, Tompkins M E
Department of Maternal and Child Health, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD 21205.
Am J Public Health. 1989 May;79(5):603-6. doi: 10.2105/ajph.79.5.603.
Utilizing the 1980 Induced Abortion File maintained by the National Center for Health Statistics, we compared gestational age from date of last normal menses and the physician-based estimate of gestational age. An average .51 week difference between the two methods was observed. Beyond seven weeks gestation, the date of last normal menses value was underestimated by the physician-based estimate with a markedly greater divergence after 20 weeks. A relatively greater underestimation of the date of last normal menses interval by the physician estimate was apparent for Whites after 13 weeks. The data of last normal menses value for non-state residents was overestimated across the entire range of the date of last normal menses gestational age distribution until 21 weeks.
利用国家卫生统计中心保存的1980年人工流产档案，我们比较了末次正常月经日期的孕周和医生基于专业判断的孕周估计值。观察到两种方法之间平均相差0.51周。妊娠超过7周后，末次正常月经日期值被医生的估计值低估，20周后差异明显更大。13周后，白人医生对末次正常月经间隔日期的估计相对更明显地偏低。非本州居民的末次正常月经日期值在末次正常月经孕周分布的整个范围内，直到21周都被高估。
