Preterm Birth: Causes, Consequences, and Prevention

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Preterm Birth: Causes, Consequences, and Prevention (2007)
Board on Health Sciences Policy (HSP)

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. "Appendix B Prematurity at Birth: Determinents, Consequences, and Geographic Variation ." Preterm Birth: Causes, Consequences, and Prevention. Washington, DC: The National Academies Press, 2007.

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Preterm Birth: Causes, Consequences, and Prevention

TABLE B-4 Gestational Ages of Live Births in the United States, 1985– 1988 and 1995–2000

Gestational Age Categories	Percentages of Births
Gestational Age Categories	1985–1988	1995–2000
% Extremely Preterm (≤28 wks)	0.66	0.82
% Very Preterm (≤2 wks)	1.9	2.2
% Moderate Preterm (33–36 wks)	7.7	8.9
%Preterm (<37 wks)	9.7	11.2
%Preterm (37–41 wks)	78.5	81.9
%Postterm (42+ wks)	11.9	7.0
SOURCE: 1985–1988 and 1995–2000 Birth Cohort Linked Birth/Infant death Data Set, CD-ROM Series 20, USDHHS, CDCP, NCHS; 1980–2000 Natality Data Set, CD-ROM Series 21, USDHHS, CDCP, NCHS.

FIGURE B-4 Trends in maturity: percentages of preterm and very preterm births among whites and African Americans, 1980 to 2000. A change in reporting of some variables occurred starting with 1989 birth certificates. Source: 1985–1988 and 1995–2000 Birth Cohort Linked Birth/Infant death Data Set, CD-ROM Series 20, USDHHS, CDCP, NCHS; 1980–2000 Natality Data Set, CD-ROM Series 21, USDHHS, CDCP, NCHS.

NOTE: Change in reporting for some variables with 1989 certificate.