以下为句子列表：
英文: Among African Americans, risks of antepartum and intrapartum stillbirth were 5.6 and 1.1 per 1,000 singleton births, respectiely; risks among whites were 3.4 and 0.5 per 1,000 births, respectiely.
中文: 由回归模型得到危险比和95%可信区间，评估人口可归因的部分以评价危险因素对死产的影响作用的大小。
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英文: Considerable heterogeneity in risk factors between antepartum and intrapartum stillbirths is eident.
中文: 非常明显，产前和产时死胎的危险因素存在相当大的不一致性。
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英文: Knowledge on timing of stillbirth specific risk factors may help clinicians in decreasing antepartum and intrapartum stillbirth risks through monitoring and timely interention.
中文: 掌握死产特异的危险因素发生的时机有助于临床医生通过监测及适时介入，减少分娩前及分娩时死胎发生的危险.
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英文: Premature rupture of membranes was associated with intrapartum stillbirth among whites and African Americans, but intrapartum feer was associated with intrapartum stillbirth among African Americans.
中文: 对于白人及非裔美国人，胎膜早破与分娩期内死产有意义，而产时发热仅对非裔美国人发生非裔美国人有意义。
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英文: These risk factors were implicated in 54.9% and 19.7% of antepartum and intrapartum stillbirths, respectiely, among African American women, and in a respectie 46.6% and 11.9% among white women.
中文: 对于非裔美国人，这些危险因素在产前及产时死胎中所占比例分别是54.9%和19.7%，而白人是46.6%和11.9%。
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