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.

• 由回归模型得到危险比和95%25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。