Thorp J M, Jenkins T, Watson W
Department of Obstetrics and Gynecology, University of North Carolina School of Medicine, Chapel Hill.
Obstet Gynecol. 1991 Sep;78(3 Pt 1):394-6.
Malpresentation is a common complication of pregnancy. Using ultrasound as the gold standard, we prospectively tested Leopold maneuvers as a screen for nonvertex presentation in the third trimester. In our hands this technique performed poorly. Values for sensitivity, specificity, positive predictive value, and negative predictive value were 28, 94, 24, and 95%, respectively, in a population with a 7% prevalence of noncephalic presentation. Much of the correlation between the screening and diagnostic tests seemed to arise from chance (kappa = 0.13).
胎位异常是孕期常见的并发症。我们以超声作为金标准，前瞻性地测试了四步触诊法作为孕晚期非头先露筛查方法的效果。在我们的研究中，这项技术表现不佳。在非头先露发生率为7%的人群中，灵敏度、特异度、阳性预测值和阴性预测值分别为28%、94%、24%和95%。筛查试验和诊断试验之间的大部分相关性似乎是偶然产生的（kappa = 0.13）。
