妊娠40周后羊水过少和羊水过多的发生率明显更高。

The incidence rates of oligoamnios and amniotic fluid muddy 40 weeks after pregnacy were significantly highter.

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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 ）。

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).

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结果：羊水过少高发于40周后。

Result: Hypamnion mostly happened 40 weeks later.

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