OBJECTIVE To assess the correlation between infant mortality and extreme prematurity by state. STUDY DESIGN This ecological study included data on 28,526,534 infants from 2007 to 2013 in all 50 US states and DC using CDC WONDER linked birth and infant death records. Regression analyses determined the correlation between infant and neonatal mortality rates and the proportion of extremely preterm, extremely low birth weight, and black births by state. RESULTS State infant and neonatal mortality rates were directly and highly correlated with the proportion of extremely preterm births (infant, r2 = 0.71, P < 0.001; neonatal, r2 = 0.77, P < 0.001) and extremely low birth weight births (r2 = 0.63, P < 0.001; r2 = 0.73, P < 0.001). The proportion of black births also correlated directly with infant and neonatal mortality rates. CONCLUSIONS Interstate variation in infant and neonatal mortality rates are primarily driven by rates of extremely preterm and extremely low birth weight births which is closely related to the proportion of black births.

中文翻译：

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早产和种族是美国婴儿死亡率的州际差异的主要原因。

目的 评估各州婴儿死亡率与极端早产之间的相关性。研究设计 这项生态研究包括 2007 年至 2013 年美国所有 50 个州和华盛顿特区的 28,526,534 名婴儿的数据，使用 CDC WONDER 关联的出生和婴儿死亡记录。回归分析确定了婴儿和新生儿死亡率与各州极早产、极低出生体重和黑人出生比例之间的相关性。结果 州婴儿和新生儿死亡率与极早产（婴儿，r2 = 0.71，P < 0.001；新生儿，r2 = 0.77，P < 0.001）和极低出生体重儿（r2 = 0.63）的比例直接且高度相关。 , P < 0.001; r2 = 0.73, P < 0.001)。黑人出生的比例也与婴儿和新生儿死亡率直接相关。