The rates of fetal intrauterine distress, cesarean section and the incidence of deficiency in amniotic fluid were obviously higher in cases of UCAN than in those cases without UCAN (P<0.01).
脐带绕颈组胎儿宫内窘迫率、胎儿剖宫产率及羊水过少的发生率明显高于无脐带绕颈组（P<0·01）。
Ultrasonography had great advantage over MRI in showing yolk sacs, amniotic sacs, extraembryonic coelom and embryocardia-beats ( P< 0.005).
MRI显示早早孕、早中期的卵黄囊、胚外体腔、羊膜囊及胎心搏动不如超声（P<0 .0 0 5 ） ；
Results The incidence rates of oligoamnios and amniotic fluid muddy 40 weeks after pregnacy were significantly highter than that of 40 weeks before pregnancy (P<0.001, P<0.05).
结果妊娠40周后羊水过少发生率及羊水污染发生率较妊娠40周前明显增高（P< 0 0 0 1，P< 0 0 5 ） ，分娩方式及新生儿预后差异无显著性（P >0 0 5 ）。
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