From 2003 to 2007, 5,002 nulliparous women were enrolled in the trial: half were assigned to structured care and half to usual care.

从2003年到2007年，5002名未经产妇女登记进入实验：一半分配到结构护理组，另一半接受常规护理。

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Methods We conducted a multicenter, randomized, double-blind trial involving nulliparous women who were at low risk for preeclampsia.

方法我们进行了一项多中心、随机、双盲试验，纳入先兆子痫危险低的未经产妇女。

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Researchers conducted a telephone survey to examine the prevalence of and risk factors for PTSD among 1581 nulliparous pregnant women.

为了找出导致PTSD普遍原因以及危险因素，研究者们敌对1581名待产的妇女进行了电话调查。

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