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JAMA. 1999;281:1370-1371.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

MMWR. 1999;48:185-189

1 figure, 2 tables omitted

Preterm birth (birth at <37 completed weeks of gestation) is the second leading cause of neonatal mortality in the United States.¹ Preterm birthrates differ by race; in 1996, black infants were 1.8 times more likely than white infants to be preterm.² From 1989 through 1996, the overall rate of preterm birth (per 1000 live-born infants) increased 4%,² and the rate of multiple births (e.g., twins, triplets, or other higher-order births) increased 19%.² Multiple births are associated with preterm birth³; trends in preterm births independent of the influence of multiple births have not been fully explored. To characterize race- and ethnicity-specific trends in preterm birth independent of multiple births, data from U.S. birth certificates for 1989-1996 were analyzed for singleton births only. This report summarizes the results of this analysis and indicates that although singleton preterm birthrates are stable overall, substantial changes in . . . [Full Text of this Article]

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