The serum nitric oxide level in term labor was significantly lower than that in late-trimester(P<0.01), and was significantly lower in postpartum than that in all the periods of pregnancy(P<0.01).
而临产妇女较足月妊娠待产妇女明显降低（P<0.01），产后妇女明显低于妊娠不同时期（P<0.01）。
The serum nitric oxide level in term labor was significantly lower than that in late-trimester(P<0.01), and was significantly lower in postpartum than that in all the periods of pregnancy(P<0.01).
而临产妇女较足月妊娠待产妇女明显降低（P<0.01），产后妇女明显低于妊娠不同时期（P<0.01）。
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