nulliparous cow 未产母牛
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。
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。
Early menarche, late menopause, or late 1st pregnancy increases risk. Women who have a 1st pregnancy after age 30 are at higher risk than those who are nulliparous.
初潮早，停经晚，或首次妊娠晚，均可增加癌症危险。30岁后怀第一胎的妇女，其危险性要高于未产妇。
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