美国每年大约有4万婴儿死亡,1984年婴儿死亡率白人为9.4‰,黑人为18.4‰。如果美国要实现1990年的目标(婴儿死亡率12‰),那么在这6年内黑人婴儿死亡率必须下降34.8%,从1980～1984年,黑人婴儿死亡率只下降14.0%,因此黑人婴儿不可能实现1990年的目标。美国疾病控制中心对1980年出生队列进行了全国婴儿死亡监测。1980年共有3,542,995个单胞胎婴儿和69,912个多胞胎婴儿。该 About 40,000 babies die each year in the United States. In 1984, the infant mortality rate was 9.4 ‰ and that for blacks was 18.4 ‰. If the United States is to achieve the 1990 target of 12 per thousand infant mortality rates, then the black infant mortality rate must drop by 34.8% in these six years. From 1980 to 1984, the black infant mortality rate dropped by only 14.0%. Therefore, it is impossible for black babies Achieve 1990 goals. The Centers for Disease Control conducted a nationwide infant mortality monitoring of the 1980 birth cohort. In 1980 there were 3,542,995 singleton infants and 69,912 multiple births. This