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

Gestational Age Categories

Percentages of Births

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.



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