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）。

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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 ） ；

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The rate of fetal intrauterine poverty-stricken, caesarean birth and less of amniotic fluid is obviously higher in cases of UCAN than 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）。

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