Holcomb W L, Smeltzer J S
Department of Obstetrics and Gynecology, Washington University School of Medicine, Saint Louis, Missouri.
Obstet Gynecol. 1991 Jul;78(1):43-5.
Cervical effacement may be described as a percentage or as residual cervical length in centimeters. For effective communication among clinicians, the percentage method requires agreement about the length of the uneffaced cervix. Variation in beliefs regarding cervical effacement and length was assessed among practicing obstetricians at a single medical center. The mean estimate for the length of the uneffaced cervix at term was 2.47 +/- 0.64 cm, with a range of 1-4 cm and a coefficient of variation of 26%. The mean estimate of physicians in private practice was significantly shorter (P less than .001) than that of faculty and house staff combined. There is the potential for miscommunication among physicians based on variation in beliefs about effacement. Adoption of the metric system for description of the cervix would eliminate hidden assumptions about cervical length and the concept of effacement.
宫颈消退程度可以用百分比描述，也可以用剩余宫颈长度（以厘米为单位）来描述。为便于临床医生之间进行有效的沟通，采用百分比法时需要就未消退宫颈的长度达成一致。在一家医疗中心，对执业产科医生关于宫颈消退和长度的认知差异进行了评估。足月时未消退宫颈长度的平均估计值为2.47±0.64厘米，范围为1 - 4厘米，变异系数为26%。私人执业医生的平均估计值明显短于（P<0.001）教师和住院医生的估计值总和。由于对消退程度的认知存在差异，医生之间有可能出现沟通不畅的情况。采用公制系统来描述宫颈将消除关于宫颈长度和消退概念的隐含假设。
